-Tribute to Dr. Slump-
Features background info about the series, character info, an image gallery (small) and an interactive map (sort of) of the village. Also has 3 language settings.
-Capturing Dr. Slump-
Another site that has story info, character bios etc. etc. It's an okay site, and almost all of the links don't work. The only reason I put this up is because you can listen to the Dr. Slump theme song!
-Dr. Slump "Ar Ya Ya" Resources Site-
A great Dr. Slump site that's just about the manga. Includes scans of the manga (you can see how it all began), also includes scans of covers (Hong Kong) and other stuff.
-Dr. Slump (no actual website name)-
This site has a good FAQs about Dr. Slump. Also has info about the voice actors of Dr. Slump.
-Dr. Slump 2nd series-
Here's a page containing info about the 2nd Dr. Slump series that aired after DBGT from 1997-99