I don't have a laptop, but cleaning the junk off the hdd should be universal in nature. Besides cleaning the temp files and junk using a 3rd party program or just the disk cleanup in Windows, there are a lot of other ways to save space.
Check System Restore if you use it. How much of your hdd space is allocated to it? If it's still at the default settings the maximum is at about 12%. I've dialed mine down to 2% and that gives me 3 to 5 days worth of restore points; depending on how many I manually make when I'm trying out new things. If you ever need to go back farther than a few days, that can often cause more problems...recently installed programs would have to be reinstalled, folders get renamed, etc. IMHO, keeping weeks and months worth of restore points is a big waste of time and hdd space.
If your system is running fine a couple of weeks after getting Windows Updates, there's no reason to keep the backup files that WU makes in the event an update causes problems and you need to uninstall a new update. You can download a free utility at Doug Knox that will remove a lot of them. The shareware version allows for more.
This utility does NOT remove application specific hotfix backups (Internet Explorer, Outlook Express, Media player and etc.). It will only remove hotfix backups that are specific to the Windows XP operating system.
If you use "bloated" software programs...programs that you only use one or two functions out of many in that program...look for other programs that are specific to just what you want or need and replace the hogs. Almost anything you want to do can be found in smaller programs or utilities and almost all can be found in freeware, if you take the time to look.
If you have Office but mostly only need Word and Excel, do a custom install and don't install all the other parts of it. If you only need to look at Power Point Presentations from time to time but never create your own, you can get a reader for that from Microsoft, instead of installing the whole thing from Office.
See what I mean? There are many ways you can trim your system down. It just takes a little research and time to get your system the way you want it.