I must concur
I was on the verge of buying a new MBP (mine is 15" MBP 2.33 GHz Core 2 Duo, late 2007). I maxed out the RAM at 3GB ages ago and was grumbling and the concept of upgrading.
I took the plunge and I bought a 64GB SSD for my primary drive and dumped my Superdrive for a caddy plus 250GB HD (http://newmodeus.com/shop/index.php?main_page=product_info&products_id=258).
It is the best upgrade I have ever made. :-) My laptop will probably last another year or so now. Poor Apple.