The official Foursquare app just hit the Marketplace, meaning you can head there now to update (see our "force update" trick) or wait till your Marketplace shows it's ready.
New features/fixes in v2.3 include:
- PERFORMANCE IMPROVEMENTS
- Facebook and Twitter settings fixed
- Live Tiles fixed
Sounds good to us, especially the performance improvements. While v2.2 became faster, it's still miles slower than '4th & Mayor' (which we find more to the point), so hopefully this will bring it up to pace (indeed, caching of existing data does seem faster). We have to give Foursquare some credit here though: they sure are taking this app seriously and treating it like the marquee app that it is (especially with the rave reviews it has received).
Marketplace link is here, go get 'em.