I'd start with the ECI CD-ROM, if you don't already have it. Here is something I'm putting together to help.
Text is available like never before.
We now has access to billions and billions of words, and even more pixels. Actually, the web isn't as large as you might think. I believe that Lexis-Nexis still has quite a bit more than the entire web, though obviously they are very different kinds of texts. I have no idea how fast the web is growing, but I could easily believe that it is much faster than that.