Here's just a few Music Collecting related websites that I have found useful. If you know of any that should be added, please do so.
Music Collectibles - for original Australian vinyl records
Rock n Records
Record Collectors Message Board
Good Rockin' Tonight
Oldies Music
One Hit Wonder Central
.. and check out this fab radio programme:
The Time Machine
... and for those interested in vintage recordings of the early 20th Century:
Digital History