I'm wondering how "real-time" are the results from http://search.twitter.com/search.atom?q= as I can't find any clear indication on that from Twitter.
I mean, is there a guaranteed lag time?
I have one application which queries the public timeline given a GPS coordinate pair, and a radius in km or miles depending on where the user is from. The results I get back are often < 1 second for items just added (i.e., with a big radius so we get more fresh results). But there is no guarantee, they could be old as sin.