Try out these links - they assume you already know a little bit about the stats, but won't take too long to pick up what's going on.
VPIP = Voluntarily Put $ in the Pot. Percentage of the time that preflop you called, bet, limped, raised, 3bet, whatever, but you put money in the pot.
PFR = Preflop Raise %. Percentage of the time that preflop you raised rather than limped or called.
The little icons are for "autorating" - there are rules that you can configure to quickly identify different player types. Whale, for example, usually is configured as very high VPIP/low PFR (i.e., limps alot preflop), Rock is usually very low VPIP/high PFR (i.e., plays very few hands preflop but raises them when he does).