I'm not sure if this is common knowledge or not, but I've just noticed on Play.com that Paradox are re-releasing some of their games and expansions as complete sets. It seems that Crusader Kings, Victoria and Europa Universalis 3 are being released. Victoria and Crusader Kings are released in four days time (4/7/08), but EU:III Collections is being released in October. Here's the links:
Europa Universalis III: Collections
Victoria: Complete
Crusader Kings: Complete
By the way, they're actually cheaper at Amazon.co.uk (£9.99)