Quick history: lots of LEGO during childhood (mainly classic Space), took time off during the 90s and early 00s, then got lured back by spotting the Collector AT-ST at a massive discount; I guess TRU just got too many in, and eventually slashed its price just to clear the shelves (seriously, it was like AU$50, crazy). That reminded me how much I enjoy building, so next week I got another set. The week after, another. And so on.
Long story short, the den's full of the stuff now, and no end in sight. Star Wars remains a favourite, along with Marvel and DC heroes, plus respectable forays into LotR/Hobbit, Harry Potter, Agents, and Space Police (the most recent incarnation), along with all sorts of other odds and ends that took my fancy. Pride-of-collections include the Death Star (the amazingly comprehensive playset one) and the UCS Executor, the Sea Cow, Simpsons house, Imperial Flagship, and (one of my rare flights of improvisation) Brickbeard's Bounty merged with most of the alien gangster vehicles from Space Police to make a gorgeously silly space pirate ship. Also a big fan of the TT LEGO games - 100%'ed every one, and I'll be quite happy for them to keep on doing what they're doing indefinitely.
This year, looking forward to finishing off the Hobbit shelf (they're all lined up in proper geographic arrangement, from Bag End on the left/West to Laketown on the right/East, just awaiting Dale and Erebor), broadening the cast of characters of the superhero shelves (especially adding Maria Hill, and oh yeah, the helicarrier as well), acquiring the Scooby Gang, and finding room for Elsa's ice palace somewhere.