I also received an e-mail earlier this week from PlanetLuck, indicating that they'd dropped $5 in my account to "bring me back". I already had $1.05 there from some kind of loyalty program. The WR for their $5 was only 1x, so using the Labouchere system, I was lucky enough to grow the free $6.05 into $20.55.
William Hill: $40 June bonus match: +$39
PlanetLuck: $6.05 free: +$20.55
Something out of nothing to date: +$671.55
Oh, and I've gotta give props to Bet365 casino -- my withdrawal from there showed up in just an hour or so, compared to most of the other sites which have taken 24-48 hours.