The biggest thing that's been biting everyone is that 2008 resets a whole bunch of labels when opening a 2007 drawing. This can be a problem so overwhelming that you REALLY don't want to open some 2007 drawings in 2008. Hopefully this will be fixed VERY QUICKLY in a service pack. Until/unless that happens, it can be miserable switching certain drawings to 2008.
Other than that, most issues seem to be minor. Overall, lots of things fixed. Still lots of bugs that were in 2007, tons of features that still need to be added, and tons of UI and stabalization work to do before this program can in any way be called "out of beta", but significantly better than 2007 SP3. And unlike the 2007 release, we've been seeing very few out-and-out crashes.
Sinc