Are they approaching antique status in that they're worth anything yet?

Actually, yes.

Might need to check if it still works then!

Put a load of it on eBay will see what I get back for it. Keeping the 9800GT and the new mobo, may be useful.

I want it but I know my wife would kill me <puts on watch>
 

I love the slogans companies put on these things usually promising way more than they can deliver, or will only be relevant for a short period of time. Guess it serves a purpose at shifting units though. The box has:

"the ultimate games console!!!!rar!e2£$"!!!"

emblazoned on it in what looks like times new roman (fail)

Bear in mind that a lot of the mobos for the Pentium D will usually take earlier-grade Core 2 Duos and Pentium Dual Cores with just a bios flash. Should be able to pick those CPUs up nice and cheaply these days and power usage figures are miles better.

The motherboards are in the council tip now. Dell and Packard Bell, so probably proprietary fittings anyway. Sold the p4d for a fiver on eBay but accidentally posted it to the wrong person :-$