We all know the 'LFG' term became widely known with the popularization of a certain MMO, and I think roll20 can really grow by taking a look at what World of War**aft has done with their LFG system. By making an integrated feature that allows players to find a group in realtime, their LFG system has evolved into a near-instantaneous matchmaking system that can pair a player with others from a pool of countless others. As the roll20 community grows in size, so too can the accessibility it provides to its playerbase. Currently players can search for scheduled one-shot games through LFG, but what if we had a more dynamic system for a more dynamic gaming style? So, that in mind, my suggestion: Introduce a 'server browser' style system for pickup gaming. This would entail having a real-time visual browser featured on the home page that displays game listings people have posted with a new "pickup" option from the "will be played:" field, specifically for game sessions that are looking for players to join and play within the same day. If implemented, this feature would be more successful if the social network side of the site received some updates - for instance options to live chat with other players, send join requests, and make games open to join. Tabletop gaming is a very organic medium, and in order for Roll20 to truly achieve its goals I believe pursuing accessibility should be one of the top priorities of the site. Not all tabletop gamers plan sessions months or weeks in advance. There are plenty who find themselves with a quiet evening and a desire to play a game, but turn to videogames because Roll20 simply isn't currently structured toward short-term gaming. Let's give the gamers a choice!
