This week's book giveaway is in the Other Languages forum. We're giving away four copies of Functional Reactive Programming and have Stephen Blackheath and Anthony Jones on-line! See this thread for details.
I've been using Subversive as an Eclipse plugin to access Subversion. I can't find a feature to compare the HEAD of a project to a tagged version. I do see compare to revision if you know the revision number. But this means checking the revision number of each tag I am interested in, remembering it and then doing the comparison. (With the CVS Eclipse plugin, I'm used to doing comapre with version and then looking at a bunch in succession.)