I am having issues using 'from' and 'since_id' resulting in 404 errors. There should be results and it certainly isn't a matter of being outside the Search time limit.
an example: http://search.twitter.com/search?q=&since_id=2147483647&from=iHateRyanB should return some results. I believe this is a bug, but it would be nice if there was some notification that the id is out of the scope of search, or that we could search through a user's timeline.
