If anyone is using gpointing-device-settings to control their touchpad and is frustrated with the version in the repos not saving settings, I have built a .deb package for i386 (32bit) on mint 8 from the latest sourceforge release 1.5.1 which solves this and also has a speed tab. This is attached to post. If you already have gpds installed, please completely remove before installing this version.
In light of difficulties some users seem to be having, please note the following.
The attachment is a 7zip file, you will need to install 7zip to extract it. This is because .deb is not allowed as an attachment in the forums.
If you have gpds already installed from the repo, you must completely remove it and the dependent libraries, in particular libgpds0, otherwise neither version will run. If you're not sure how to do this ask.
Once installed it should appear in the mintmenu as Pointing devices under Preferences.