Hmm, see what you mean. Have been toying with the idea of getting 8GB of the OCUK value memory, and see its gone up today...
Still the OCZ 667MHz is going for £50 for 4GB, and seem sto OC quite well, so maybe will think about getting some of them.
Things is I want my system to last until end next year (maybe a little longer), and with memory prices as they are, whether or not 8GB is needed, may as well get it now while its still relatively cheap rather than find its doubled (or more) when/if 8GB becomes handy.