I posted here about the lack of a particular feature in VS 2005. Turns out that it's already there, but turned off by default. (Thanks Rory for pointing it out!)
I'm not sure why - everyone I've talked to about this thought it should be turned on by default.
I was going to crack open the IDE extensibility area to add it myself, but it's already done.
I wonder how many other useful features are "hidden" in VS 2005/TFS?