Found an awesome list of alternative and useful search engine sites and I just had to share it with you guys, its a lot of fun!
Written by Charles S. Knight, SEO and edited by Richard MacManus. The original version of the Top 100 Alternative Search Engines List appeared here on Read/WriteWeb on January 29, 2007. Every month, we'll be updating the list and selecting a "Search Engine of the Month". At the end of the year, we'll also select an Alternative Search Engine of the Year.
AllTha.at is The search engine that keeps on looking
Ask Mobile is a Mobile search engine from Ask.com
ASK VOX is a A second talking female user interface.
AnswerBus is a Ask in English, French, Spanish, German or Italian.
Blabline is a Podcast / videocast search engine
blinkx is a Video Search
boing is a Search the Mobile web
bookmach.com is a Searches for posts related to your keywords.
ChaCha is a Human Guides are available to aid in your search.
ClipBlast! is a Video Search
Clusty is a Clustering search engine
collarity is a Behavioral personalized search / Collarity Compass
CONGOO is a Searches for Premium Content
crossEngine is a Searches Search Engines; formerly mrSAPO
d e c i p h o is a Behavioral personalized search / Social Meter
Ditto is a Visual search engine
Dogpile is a MetaSearch Engine
dumbfind is a Featuring the Two-Box search method.
exalead is a Web / Image search with a European flavor
factbites is a Search Result snippets are complete sentences.
fazzle is a Search engine that emphasizes Boolean Search
filangy is a Personalized Search Engine
FIND FORWARD is a Multi-featured search engine; check this one out!
FindSounds is a Search for sound effects and musical samples.
FyberSearch is a Parent site for some interesting new search engines.
GIGABLAST is a A multi-featured search engine.
girafa is a Visual search engine - results are thumbnails
gnod is a Oustanding recommendation search engines
gnosh is a Metasearch engine
GoLexa is a COMPLETE page analysis for each result.
goshme Beta 3.0 is a A search engine for search engines. Top 10 pick.
GoYams is a Metasearch engine where you select the mix.
grokker is a A multi-featured meta-search engine.
GRUUVE is a Groovy music recommendation search engine.
hakia is a "Meaning based" search engine
ICEROCKET is a Blog search engine
ixquick is a Metasearch engine
KartOO is a Visually appealling clustering search engine
Lexxe is a Natural language processing (NLP) search engine
like is a Visual shopping engine; see also riya
liveplasma is a Attractive music / movies clustering / recommendation engine
Local.com is a Search for local businesses, products, and services
lurpo is a Searches for custom Google search engines
mamma is a metasearch engine
MetaGlossary is a Searches for definitions, phrases and acronyms.
mnemomap is a Clustering search engine
Mojeek is a Customize your own personal search engine.
Mooter is a Clustering search engine
mrquery is a Metasearch engine / metasearch providers
MS. DEWEY is a Unique user interface - enough said.
Omgili is a Social community search engine
onkosh is a Arabic / English Search Engine
Pagebull is a Visual results search engine
pipl is a People search engine
PlanetSearch is a Metasearch engine
PolyMeta is a Metasearch and clustering search engine
pronto.com is a Metasearch engine
qksearch is a Multi-featured "3-in-1" multi-search engine
Quintura is a Clustering search engine with a new interface
Quintura for kids is a Search engine for kids by Quintura
RedZee is a Search Engine with nice preview results
retrievr is a Visual search engine
riya is a Visual search engine; see also Like
scirus is a Scientific information only search engine
searchbots is a Have a little fun, create your own searchbot.
SearchTheWeb2 is a Search The Popular Head and The Long Tail
sidekiq is a Multi-category search engine. Very nice.
Slideshow is a Displays search results as a moving slideshow.
Slifter is a A mobile shopping search engine.
soople is a A simplified version of Google's search options.
Speegle is a The speeglebot talks to you.
Sphere is a A blog search engine.
Sproose is a Social search engine
S R C H R is a Metasearch engine
SurfWax is a Meaning-based search engine
Swamii is a Search engine that keeps on searching for you.
Swoogle is a Semantic Web search engine
thefind.com is a Shopping search engine
Trexy is a Follow "trails" and "trailblazers" with Trexy.
turboscout is a Metasearch engine
TWERQ is a Multi-category search engine with tabbed results.
UJIKO is a A fun interface where you can vote on the results.
url.com is a "Search with many" community metasearch engine.
VMGO.com is a Vote on the search results with emoticons.
WASALive is a A new member of the list.
Web 2.0 is a Web 2.0 search engines
WEBBRAIN is a Clustering "see the web" search engine.
whonu? is a Deluxe metasearch engine.
WIKIO is a "Live information from 33981 media and blogs"
Windows Live Mobile is a Windows Live Mobile search engine
WiseNut is a Clustering search engine
Yahoo! Mobile is a Yahoo! Mobile search engine
Yahoo! MINDSET is a Intention-driven search; commercial versus research
yoono is a People-rated community web search
yoople is a Yoople! = Yahoo! + Google + People
yubnub is a Use command lines to search the web.
ZABASEARCH is a People and Public Information Search Engine.
zapmeta is a Metasearch engine
Zippy is a Search engine for webmasters
ZUULA is a Multi-category, multi-search engine, with good tabs.
Full Original: Top 100 Alternative Search Engines, February 2007