VS2010 has made it easy to write extensions via MEF exports and imports. However, if you want to do anything useful you have to know what service provider(s) you need to implement your super awesoem extension.
Unfortunately, this information is often spread out all over the place, not well documented or both.
What I'd really love to see is a comprehensive list of all service providers that you can import into your VS extension, and what those providers... um, provide. Has anybody seen something like that?