30GB is fairly small so I would recommend a couple things:
1- Disable Recycle Bin for that drive (see Beginners Guide HTPC Basics)
2- Disable Hibernation
powercfg –h off
3- Install W7 SP1. It requires 16GB of free space and you most likely will never have 16GB of free space after using the system.
Note: If you are are a Media Center user you will need to setup and get NetflixInternetTV installed prior to SP1. One of the later updates prevents it from installing.
4- Reduce your pagefile. Solid state drivers are great for paging files but you aren’t going to have much room so I recommend setting up a static size versus letting Windows configure it (I actually do this on all my systems regardless)
5- Turn off System Restore
6- Turn off Offline Files
Past that I would not move other cache files. At least not initially. See how much space you have after a month of normal usage. You can adjust then as needed. I see a lot of people move cache files (i.e. %ProgramData% folders, %AppData%, etc) but then you really are limiting the potential usefulness of your SSD.
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