A couple days ago, WOTC posted what planes are in the Magic universe so far and a quick summary of what happened (or is happening) on those planes. Thought it was interesting to catch up...
Fun reading. I've only visited a few of those places myself... Shandalar being my favorite. Just... don't try going to Shandalar... they don't take well to Planeswalkers... especially Planeswalkers who can get around their barrier.