Bookmaker Bonus
To have the finger on the pulse regarding latest bookmaker bonus offers you should have a look at wosb.com. They have bonus summing to more than 10000 euro and the complete list is updated every month.
By far the the most comprehensive list I have come accross. A disadvantage can be that the bookmakers term and conditions are not listed, but still it gives you an overall insight into the different offers.
An alternative bookmaker bonus list can be found at betbrain, but the list seem to be far from updated, and further they contain bonuses from much fewer boomakers.