Guys,
Don't know if there's a specific beta forum for logging bugs (haven't seen one), so I'll put the couple I've seen here:
1) Texture flicker - When creating my second city I noticed the selection box was shimmering around the edges implying the texture was drawing at slightly off co-ordinates.
2) For such a 'simple' part of the game I have noticed that it is maxxing my Radeon HD 4850's fan speed. Given whats on screen this shouldn't be required.
3) There's no 'apply' option that I could see for the video options page hence my screen resolution changes weren't applied.
4) Road 'path finding' is wrong - creating roads between two of my cities ended up linking my city to an 'enemy' city that was at that time hidden in unexplored land rather than going to the city specified (I couldn't get my two cities connected by roads at all) -- given the focus of this beta I'm aware this may be useless information.
Let me know if there's a better location to post these sorts of reports.