Do you want to create more storage and get more organized or use it for a workshop or man cave or ... ? If you give some more specific direction, I am sure folks here will help out.
Other than that, go pick up a book called "Your Garagenous Zone." Besides having a hilarious title, it has some great tips for remodeling garages. You can buy it here, or your library might carry it:
If you are like me (and many others here) lots of organized storage for your tools is a must. You can also hang racks from the ceiling to use that otherwise wasted space as well.
ok, thanks steve ...
@ dan ... great idea, thanks!
Fortunately, the big box stores now have those DIY units that look rugged and guy-like that would be a nice way to finish something as mundane as a garage.
Be prepared to pay, but be prepared to be Wow'd with the results...