What other options are there for seamless integrated/integral sinks are there out there?

Corian makes countertops with integrated sinks that look like they'd work ok in both a kitchen or a bathroom. Onyx makes counters with integrated sinks and lips/backsplashes but they are only appropriate for bathroom use. There are a number of cement fabricators out there, but I'm a little leery of cement as it seems like it's fairly high upkeep.

For the kitchen, looking for something that can truly withstand the rigors of cooking as I cook twice a day.

For the bath, looking for something super easy to clean.