Most online poker sites are members of larger networks which use the same software and share tables to provide a larger playing pool. In fact it is entirely possible for 10 people to be sitting at the same online poker table, but each playing through different a brand. The only real difference between the brands are the promotions they offer their players.
The following articles contain information about each of the major poker networks, as well as lists of bonuses that are available to players. Don't forget you can switch from one site to another to claim a juicy bonus whilst still playing the same games with the same players on the same tables.
