I think that's a throwback to when Twitter Search was Summize and they had to come up with their own user IDs. I think they will be making them the same in the new API.
Adrian wrote:
I've found that the user IDs in search feeds for any given user mismatch with those in the normal twitter feeds. Take for example @arikfr: ID: 12069702 http://twitter.com/users/show/arikfr.xml Now goto a search lookup: http://search.twitter.com/search.json...@arikfr or http://search.twitter.com/search.json?q=to:arikfr and the same user's ID is 3341
