I was convinced in the comments for this post to follow a pace of 10 pages a week for the group read of Illuminatus!
How about if we begin on Feb. 24? Everyone is welcome to join us. We'll follow the usual procedure -- I'll post something, and then everyone can post in the comments. If anyone is interested in doing a guest post, taking over for a particular week, I'd be open to that.
Illuminatus! is available in a wide variety of formats — as a trade paperback, as an electronic book and as an audiobook. Gary Acord was able to pick up a very cheap used copy on Amazon that was quite readable, so a late February start date should allow everyone time to rustle up a copy.
I plan to re-read James Joyce's Ulysses by that time. I am thinking about re-reading Robert Shea's All Things Are Lights, a kind of thematic prequel to Illuminatus! Of course, the Historical Illuminatus! novels by RAW count as a kind of prequel.
If you are looking for supplementary books, I have a couple of suggestions.
An Insider's Guide to Robert Anton Wilson by Eric Wagner has a number of sections that are directly useful, including a chapter on the kabbalistic structure of Illuminatus! and an Illuminatus! timeline. A long lexicon explains many references in Illuminatus!
Virtually everything RAW wrote after the trilogy can be seen as a supplement to his most famous work, but I would point out that The Illuminati Papers includes many pieces credited to Hagbard Celine, Simon Moon and other characters who appear in Illuminatus!