MKIII owners, this site will become your best friend! Make good use of the search function in the top navigation bar, there are hundereds of tutorials, step by step instructions and answered questions. A great community of knowledgeable people who share a common passion. Also has sections with info for MKII, and MKIV generations.
The premier MKIII technical information site. The experts on here really know their stuff.
Showcases some of the most powerful 7Ms out there
This site is more oriented towards MKIV owners and is loaded with tons of good discussions and tutorials.
MKIV Toyota Service Repair Manuals
Great thread on Oil Filters
A great place to check out MKIV, MKIII and MKII Supra Parts.