I finally did the upgrade to DNN 3 this weekend. The upgrade itself was pretty easy except for running into a few quirks.
For example, if I had disabled the title for a module in DNN 2, it seemed that the migration process just gave that module an empty container in DNN 3. That meant that I didn't get any edit buttons and wasn't able to do much with the module other than delete it through the database.
I found updated versions of LinkImage and SimpleDownload to go along with the MultiPage Content module and a few others.