I have a test computer with several hard drives in it, each with a different operating system. When I need to test a new software program or hardware peripheral, I can quickly assess its compatibility across several platforms with this computer. The hard drives are a mix between Western Digital Raptor 36GB and Seagate Barracuda SATA-V 160GB models -- fairly new, fairly fast, and presumably spacious enough for my test OSes. It did not occur to me that I might ever run out of space on the 36GB drives because there is very little "real life" data on it -- just a few megabytes worth of documents, pictures, and other test data. Since switching to Linux and BSD, I have come to think of personal data as being the big storage sink, with the operating system and desktop software being the minimal part of the hard drive's space. Well, that doesn't hold true in Windows Vista. I made the mistake of putting 64-bit Vista on one of the Raptor drives, and after a little over a month of sporadic, short-term use, I'm out of free space. This, to me, is astonishing. How is all that space being used?
How big is your desktop software stack?