While trying to find out how to find the differences between revisions using Tortoise SVN, I came across the following articles that might be useful for someone starting out with Tortoise SVN. Well the manual is always the best place but if you're like me then you will like the pretty pictures.

Setting up and running Subversion and Tortoise SVN with Visual Studio and .NET. However, I must mention that Ankh seems to work well for me for VS integration. The only problem I came across is when a commit to an online repository fails and it causes Visual Studio to hang as well. Then, you will need to kill the Visual Studio process manually. But then, it's not like the first time some program has to be terminated manually in Windows.

For BeyondCompare lovers out there, this page teaches you how to replace the default diff tool in Tortoise SVN with BeyondCompare.

And if you ever wondered what the pretty folder icons all mean after you install Tortoise SVN, you can read more about it here.

Sadly, I never found the solution to my initial problem. However, I think I will just checkout the revision I want to compare with into another folder and then use BeyondCompare. For the moment, I don't do this too often. Otherwise, it's going to be a pain in the ass.