If you are using HTC Sense, either on your HTC HD2 or another device, you might have noticed that by default, if you navigate to the Internet Tab, there are ten slots for site thumbnail bookmarks.

Now there might be some people to whom ten is enough but if it’s too much or too little for you, you can customize that number to your liking, as long as it’s a multiple of two. To do that, edit your Registry by going to HKEY_CURRENT_USERSoftwareHTCManila and change the value of InternetCountOfPush from default 10 to the number of your liking (just make sure it’s a multiple of two), followed by a Soft Reset to enable changes.

(Source: XDA Developers)