Aside from it being obvious, I'm pretty sure there's prior art for specifically what this patent describes. One of the times this was posted to Reddit someone posted a link to a book that describes pretty much exactly what's in this patent, with a diagram no less. http://my.reddit.com/r/programming/comments/1bbb3/congratula...
1. The linked list was described in 1957 or earlier.
2. The cited mention of the linked list also considers more complex permutations of lists.
3. This patent effectively describes adding a single set of items to multiple lists (I haven't read the patent, so I may be glossing over details).
4. #2 demonstrates that such a permutation of the concept of a list would be obvious to anyone skilled in the art.
5. Therefore, the patent is invalid.