Casino Del Rio and Europa probably deserve a thread of their own, not so much for the bonuses being bad as for the comically blatant lies - e.g. this e-mail with the subject: "Risk-free Blackjack"
"Enjoy 24 hours of risk-free blackjack at Casino Del Rio!
Simply deposit at least £100, and earn 150 comps on blackjack. If you end the day with less than 100% payouts, we'll kick-back 25% of the dealer's take!"
So how does that work out as risk-free?
Though they've got competition from this Casino Fortune offer:
"No RISKS JUST TREATS!
Start Date: 14th April 05 - End Date: 20th April 05 at 12 midnight!
Risk 100 Get Treated to 125, it's that simple."
Tip for all casino
PR staff: if you're going to contradict yourself, try and at least leave a bit of a gap between the contradictory statements!