Re: I don't listen to Led Zeppelin... introduce me!
Most classic rock stations seem to put their stuff on fairly often.
If you can't get a feel for them that way, you might want to get the Page / Plant "Unledded" video. It's a good introduction / overview to LZ's music. That's how I started. Then I bought the full boxed set.
Great stuff, lots of great gems in those 10 CDs.