I figure it is worth adding to this topic that iPoker has split into two seperate networks now, commonly referred to as iPoker1 and iPoker2 - apparently some of the big names such as paddy power were unhappy that their marketing budget was adding players to the pool of other, much smaller sites.
Right now the iPoker2 network includes Betfred, Poker770
, Titan Poker
, WillHill, Bet365
, PaddyPower, Winner, Coral, Ladbrokes
and Betfair - if your playing on an iPoker skin other than these, I would try and find out which part of the split it is on, as there is far less action - and apparently, much tougher players - on the other iPoker 1 network.