Thanks to TV ads and sponsorship of live events like the World Poker Tour, Party Poker was the first online poker site to capitalize on the poker boom and became one of the biggest poker sites. Atlhough they are no longer the largest poker room, their recent merger with bwin makes them the 3rd largest online poker network. All of the sites on the Party Poker Network are operated by the same company (Bwin.Party Digital Entertainment).
Sites on the Party Poker Network use a decent filter system for cash games and tournaments, which allows players to filter games by game type, stakes, game features (jackpot, stack sizes, etc), speed, seats, players/flop, avg. pot, etc. However, players cannot select multiple game types for the cash game filter, and cannot specify precise buy-in ranges for the tournament filter, just low, medium, or high. Also, the filter is always present in the main lobby, rather than a separate window that you open once, set, and then ignore.