So, figured I do the introduction thing before jumping into random threads (which I plan to do shortly, no worries about that).
I started playing Dominion at the Wednesday lunchtime boardgames club at work, and I loved the whole idea of deck-building so much that I bought Base+Alchemy at the local-but-not-cheap game store, introduced my girlfriend and her brother to it, and we then traveled 3 hours to pick up every other expansion (at the time) from the not-so-local-but-quite-a-bit-cheaper game store. We now have everything up to Hinterlands, all sleeved and neatly stored in some surprisingly appropriately-sized fishing tackle boxes, and eagerly await Dark Ages and Guilds.