Here is a nice tutorial as to how to add a new search engine to Google Chrome

Here is a list you might want to add it to yours -

Here’s a list of search URL’s for some search engines, in case you want to set them manually:

• Yahoo!: http://www.yahoo.com/r/sx/*-http://search.yahoo.com/search?p=%s&fr=yfp-t-501&toggle=1&cop=mss&ei=UTF-8
• Wikipedia: http://en.wikipedia.org/w/index.php?title=Special:Search&search=%s
• YouTube: http://www.youtube.com/results?search_type=search_videos&search_query= %s&search_sort=relevance&search_category =0&page={startPage?}
• Digg: http://digg.com/search?s=%s
• Chromable: http://chromable.com/?s=%s
• Last.FM: http://www.last.fm/music?m=all&q=%s
• DMOZ: http://search.dmoz.org/cgi-bin/search?search=%s
• Baidu: http://www.baidu.com/s?wd=%s
• Facebook: http://www.new.facebook.com/s.php?ref=search&init=q&q=%s