Blog: Visual Studio add-ins, extensions and tools
visualstudioaddins.svprogramming.net
visualstudioaddins.svprogramming.net
EDIT: So the story, just in case anyone is interested, is this. I was doing an internship at a small healthcare company in the IT department and was writing a web app in asp.net mvc. I downloaded the ViEmu trial and had been running it for about a month and was loving it. But then my trial was about to expire and I only had like 3 weeks left at the company. I made a random one-off comment about how I wished I had just an extra week or two on my trial as this was pretty much the only time I would be using VS. The developer emailed me with an extended trial key and was extremely helpful throughout the entire process.
You may want to check out ReSharper which is just fantastic, http://www.jetbrains.com/resharper/
Resharper slows VS down immensely and adds way too much cruft in my opinion.
If its slowing your machine down, there's a few things you can do like turn off code analysis which will help, you can optionally run this later.
As for the additional things it "adds", there's pretty much an option to enable/disable/customise everything.