There are many discussions and there is TREESIZE you can go exploring with. My machine is now hitting about 30GB just for the OS. But I have XP MODE, Virtual PC installed along with the full VS2008 so it will be big.
Again, yours sounds normal and there are lots of discussions about this. Welcome to the new OS.
Last week I bought a Toshiba M505-S4985-T with 320 GB's of hard disk space and Windows 7. I know that the OS takes a couple of GB's and other programs installed from factory settings. When I started using the computer I had 283gb's, so I installed itunes with 10gb's of music and also like 4gbs of pictures. I cant understand why now I have only 238gbs of free space!!!!!
Where all those gbs went??? Cant understand, can someone help me figure it out??