Technical diving has a lot of aspects. There are individual, fundamental skills, like air-sharing, valve shutdowns, line running, no mask work and bottle work. There is the multi-tasking involved in managing buoyancy and trim while executing those skills, and the judgment involved in assessing a situation and deciding what the appropriate action is. There is also the matter of decompression, understanding the various approaches to it and planning the appropriate decompression and gas supplies for the proposed dive.
The majority of this stuff is not best learned from a website, or any other non-interactive learning strategy. However, there are two places where you can begin to acquire skills and knowledge, while awaiting formal training. One is with the fundamental skills. You can begin to work on your buoyancy control and your trim, and begin to learn propulsion techniques, with the help of a similarly interested buddy and some video information. I highly recommend the 5thD-X Intro to Tech DVD, which is VERY well produced and very useful.
You can also begin to educate yourself about decompression, about which a great deal is available on the net. On TDS, there is an excellent article entitled "The Shape of the Curve", by Steve Lewis, who is a technical instructor and an excellent writer. It's a good place to start. You can also find articles by Erik Baker and Ross Hemingway and I believe also by Bruce Wienke (I'd have to drag out my binder to figure out exactly what I have found and printed out over the last three years.) There are also some excellent books -- I particularly enjoyed Lippmann and Mitchell's Deeper Into Diving, which includes a fairly extensive review of a number of approaches to decompression modeling.
Anyway, that ought to get you started!