Official Sites:

The Official Jurassic Park Site
The official Universal Studios site for all the Jurassic Park films.

Elsewhere on the Net:

Jurassic Park III - Hasbro - Toy Fair 2001
Pictures of the Hasbro JP3 toys at the 2001 New York Toy Fair.

Jurassic Park III - LEGO - Toy Fair 2001
Pictures and information about the JP3 LEGO building block toys shown at the 2001 New York Toy Fair. These are part of the "Studios" LEGO product line.

Dan's JP3 Page
This fan-run news page has reviews and merchandise news.

InGenOps
InGenOps has a toy section with an archive of JP toys and action figures, with checklists and pictures. The site also has sections for the movies, fan art and fanfic, forums, and a newsletter.

JP Toys
An archive of action figures and toys from all three Jurassic Park films. Also includes a forum and news about sales on JPIII merchandise.

JP3 HQ
This is the merchandise page for JP3 HQ, so it includes non-toy items as well as action figures and toys.

Jurassic Park: the Kenner Archives
A Jurassic Park (first movie) toy archive.

Jurassic Park Toys
An archive of action figures and toys from all three Jurassic Park films as well as the other JP series, including Chaos Effect and JP Dinosaurs.