I switched from Subversion to Git as my day-to-day VCS last year and am still trying to grasp the finer points of \"Git-think\".
The one which has been bothering me
In my office we'll put the release webpage address in the tag body. The release webpage details all the different new features and fixes since the last release. Management won't be looking in the git repo to find out what changes happened, and it's nice to have a concise list of what's in that release.