Aside from the obvious (BG series), I'd have to go with Warcraft 3. The reason being that I just picked this little gem up packaged with the expansion pack when it was heavily discounted. I know I missed the hype but its really sucked me in. Apart from that I'm just enjoying the pleasure of LAN and online gaming with Battlefield 1942 and its various mods.
Final Fantasy 2(4) was what got me into RPGs in general, and loved them ever since. I also happen to be a big fan of the RTS genre, crediting my love of them back to Warcraft 2.
