The particle physics data base Inspire has a link to all of the Tasi lectures which can be found on their system. The link is here . This is the top of a search tree. Under it are links to material from Tasi's all the way back to the epoch (1984). Clicking on a Tasi will reveal the next level, a list of all the lectures that Inspire knows about.
If you know the year of the lecture you are looking for, you are all set. But maybe you don't? Then the next part might be more useful. I've tried to catalog Tasi lectures by subject, with a link to the text someplace in the ether. Here we go:
But after a while, I gave up. Too many lectures are one of a kind! Here's a list of everything I found, in one file, by year. Yes, it is redundant, but maybe just browsing the titles will be enough to give you ideas. I've only listed lectures which are available for free, with their URL.
Lectures can appear in many formats. The most likely one will be a link to an arXiv number. In recent years Tasi proceedings have been collected on the Proceedings of Science web site. Some links on the Inspire page will go the the World Scientific web site. These articles are only available for purchase, so I didn't list them. Typically, that means the author didn't post the article to the arXiv. (If Inspire found the article it was probably published in a Proceedings. Libraries used to collect these, in the days when libraries had physical books. Try asking you librarian for help.) Finally, a few really old articles are found on various web sites of scanned preprints -- a nostalgic place for those of us old enough to have written the equations in our preprints by hand, in ink. Some of the links to PDF's for these old articles failed when I clicked on them, so I didn't include them, either.
Tom DeGrand
1990 -- all clicks on PDF's hung