Groklaw, which advertises itself as “When you want to know more but don’t know where to look” has put together an exhaustive list of links in a Patent Resource Page. Frankly, I was starting to get carpal tunnel syndrome just scrolling through the list.
While heavy on software patent and Open Source issues, it is worth noting for those in virtually any field. Check out their great resources for info on patents, patent law, international aspects and even resources regarding patent busting and submarine patent issues.