Takes a comma delimeted list of search terms and returns results from Twitter's search. You can put more complicated search terms including those with negative keywords in quotation marks (for example "chocolate -snickers",twix,"Mars -planet -space -lander"). Tried to have ability to exclude a delimited list of Twitter usernames, but couldn't make it work with the loop operator. You can modify it easily to exclude a few if desired, or hard code it. This pipe also attempts to parse links and turn @replies into links as well, but no guarantees on the RegEx.
Pipe Web Address: http://pipes.yahoo.com/randyrockman/twittersearch