Re-installing OSX, what should I keep?

I think it's time I re-install OSX, all the issues are having are crippling my computer and its time to clean up.
In theory I should be able to pop the OSK install disk and it will keep all my apps and settings, right? I don't want to loose all the stuff I've installed!
In any case I have a TM so I have a fresh backup done.

you can try an archive and install as suggested already but some of your problems might be caused by all those apps you want to keep and/or user settings. if A&I doesn't solve your issues you should do an erase and install and reinstall all your apps from scratch. see this link on what you'll need from your old home directory.
http://discussions.apple.com/message.jspa?messageID=6185507
you can restore those things from your TM backup after doing an erase and install.

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