The urge to add fruit (cherries in particular) to beer seems endemic in Belgium, and these styles haven’t escaped. Unfortunately, these krieks are going the same way as their sour cousins, and are very difficult to find now.
Rodenbach has ceased production of their Alexander (Grand Cru sweetened with cherry essence), and since Crombé ceased brewing a few years ago it is next to impossible to find their Oud Kriekenbier (the only beer made with 100% whole cherries), which was the best of the lot.
The best-known fruit beer is probably Liefman’s Kriek.
The Dogfish Head brewery recently came out with an interesting fruity take on the IPA with its Aprihop Beer.