If you can still purchase issue #91 in your local bookstore jump on it. In this issue there is a tutorial by Bassam Kurdali on rigging a fully posable worm character in Blender.
This is one of the best advanced rigging tutorials I have seen. Bassam walks you through the process step by step. The resulting rig reminds me a bit of certain parts of the Mancandy setup. The rig itself involves the use of lattices in conjunction with armatures, if you've been wondering about Bassam's techniques this is a good look at how he does it. Below is a shot of the first page. The tutorial itself is four pages in length.
If you happen to have missed purchasing this issue in your local bookstore, it can be purchased online here.