iamcaltrain is an attractive mashup of Yahoo maps, Flickr, and the Caltrain schedule. I've posted my own Caltrain hacks before (Caltrain vis, Caltrain tags), so anything that makes my commute easier is bound to catch my attention. iamcaltrain almost did it, but it needs a couple of tweaks:

• I can get a station-to-station schedule, but I can't bookmark it
• Reloading clears the schedule I'm looking at
• Bug: To get from Mountain View to Menlo Park leaving right now it gave me the option of taking the next train to Menlo Park (15 minutes) or taking the same train all the way to San Bruno and catch a train back (1 hour 24 minutes).
• Bug: If I type the name of a station in the start or end boxes, it assumes I'm typing an address