Well, hopefully I'm not just mentioning something you already know, but there's one thing I remember from earlier postings: if you're using the stock heatsink, I'm told you'll get better results if you mount it so that the ridges are vertical instead of horizontal.
One, this gives you more room for mounting the HD; even if you need to trim the heatsink, it's a lot less to remove and you get more useable cooling surface. Also, and more importantly, it allows for better cooling, since as air flows up along the ridges. Of course if you use it with the screen rotated to portrait, that's different.
The disadvantage to remounting the heatsink is that it may interfere with access to the SODIMM slot, though unless you change your memory frequently it's probably not an issue. It will only take 256MB max anyway, and only if you can get the proper type.
If you've already modified your heatsink and wish you hadn't, I've got mine somewhere, doing nothing keeping the dust from touching one small part of a shelf. I went with the Lasagna fan method right off the bat. I also have an extra 128MB SODIMM somewhere, probably on another shelf. If you're interested, let me know and we'll work something out.
