I got a new phone[1] today which has a GPS. One of the first things to do is determine how well aligned the Yahoo! imagery is. Around my local area[2] it appears to be spot-on. On Sunday I'll be heading a bit further north towards Salt Lake City so I'll see how well it lines up. The TIGER data around there doesn't match the Yahoo! imagery - I suspect the imagery will be correct and the TIGER data misaligned, but it will be good to know for sure.

[1] T-Mobile G1, a rebranded HTC Dream running Android.
[2] Orem and Lindon, Utah, USA.