I overclock my laptop from 1.6GHz to 1.76GHz(10% overclock) using clockgen. But since you are using Intel® 915PM chipset, I'm not sure if your laptop can be overclocked by clockgen. I have a very good article for you: http://www.rojakpot.com/showarticle.aspx?artno=177&pgno=6

Nowadays, technology changes. Laptop is no longer a not-much-of-use plastic just to listen to music, surf around the net and type documents. Many people has started to abandoned desktop and get themselves a good laptop to make it a portable workstation. Moderate gamers should be pretty satisfied with what the laptop can give them. For me, laptop is indeed my workstation. I use not only for games but distributed computing and some simple webhosting. After a few weeks using laptop, I dump my desktop to my cousins.

Nope. No sign of burns yet. Pentium M or similar mobile processor have a maximum temperature rated at 100 celcius, critical temperature at 93-95 celcius. Without overclocking, my thermal probe reads 70 celcius. After overclock an extra 10%, it's about 76 celcius. It's still pretty far from the critical temperature. I have tried overclocking to 2.1GHz, it's about 84 celcius. Just wash the heatsink and replace the thermal paste monthly and it will never go wrong.