Gamespy in their review of SC:S note that the first patch for the game has been released.

EA notes that the “day one” patch now available on its servers should smooth out any framerate issues

The changelist as given by EA is as follows:

2 exclusive buildings & 2 terrain maps
Improved install experience for custom content downloads
Optimized shadows
Fixed a random crash bug
Improved localized text
Improved pollution UI
Improved effectiveness of Power Purchase special action

You have got to hand it to EA that they do start handling issues immediately here.

With the game having been released (at least by some stores) the forum at the official SimCity Societies page has come alive as well, and the first game mods have been uploaded to the mod exchange.