Unlikely we'll see any sort of upgrades to that site as the guy who built it got out of Supras about 2 years ago now.
There are three links at the upper left, they go to three different Toyota pubs: TSRM (Toyota Service and Repair Manual), EPC (Electronic Parts Catalog) and TEWD (Toyota Electrical and Wiring Diagrams).
I prefer the TEWD to the TSRM for wiring and electrical issues (go figure). I've found errors in both though...Oh well, no one's perfect.
The EPC is a bit difficult to use at first for most people and a lot of people never manage to really understand it.
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