What pads are compatible?
They look like standard Shimano-type cartridge brakes. No need for new blocks, just get a set of pads.
I recently got these and they are really good - far better than the standard shimano ones: http://www.wiggle.co.uk/kool-stop-dura-aceultegra105-pair-of-cartridge-inserts/

Go for the salmon if you have non-carbon rims.

EDIT: I seems your brakes do not in fact have cartridges but the brake pad is a single piece that connects directly to the caliper arm. The dura-style cartridges (like the ones you linked to) will fit on your calipers and is a worthwhile upgrade. You will be able to more cheaply and easily replace pads and have a wider choice.