http://www.anandtech.com/storage/sho...px?i=3531&p=31
I have to admit that I haven't been the most up to date with SSD technologies, and there are quite a lot I did not understand, notably the cause of performance decay as the drive fills up. The articles explains all the basics and while a bit long, and feel a touch personal at times, gave me a much better understanding of SSD drives today (incidentally, you can't prevent the decay by simply half-filling the drive buy continue to create/delete new drives).
It looks like the OCZ Vertex (and indeed, drives from other manufacturer who choose to use the same controller) is worthy of the interest it has attracted. Personally I still can't justify the cost (over £3/GB), but it seems to be the cheapest SSD that properly beats the VelociRaptor (nearly) all round.