My Desktop has a Terabyte of hard drive space, so I pretty much have everything installed, except maybe some old games I still have the disk for, BF2, StarCraft, but I'm just too lazy to put them on.
On my Laptop, I have pretty much everything that it can run, which is to say, not much at all. For whatever reason it has two separate hard drives, each around 130 GB, but I hate the D:\ drive with a passion, so everything I have is on C:\ and since they are separate there is no way to re-partition the data. As such I'm pushing the memory limits, and I'll probably have to uninstall some stuff eventually, only got roughly 9.5 GBs free, which turns the hard drive icon into a red bar, which really bothers me. I'll clean it up eventually, until then though, everything that can run on my laptop is installed, that's just a rather small library.