I would just make sure the fan vents are not covered. As long as it can vent the heat properly, you should be okay.

BTW, I really like my HP Mini 110. I'm only going to use the Asus T91MT for eBook and PDF reading, whereas my Mini is the portable work horse.

I definately agree that there are too many models. I think HP changes the model number whenever it modifies any one model, even if it is a very minor modification. The exact same hardware that has Win XP factory installed will have a different model number from a model with Win 7 factory installed. A model with a 250 GB HD will have a different model number from the same computer that has a 500 GB HD. And so forth. I have even noticed that HP will sometimes rename a model for a specific retailer. For example, Best Buy often asks manufacturers to strip out some of the options so they can sell the computer cheaper than their competition, so HP will do so and slightly change the model number. Plus as you know, today's newly released model will be superceded by a newer model within just a few weeks, often with little difference in hardware or software. I think it is ALL ABOUT MARKETING!