Well considering 2008 just came out, it's 4 year old software...so not super worthwhile.
You would have been better off with the deals when you could get 2004 and 2008 for $25 (black Friday only), or the other deal for getting both for $125, but I think that expired too, unfortunately.
So I guess if your only other option is paying full retail for 2008 and you don't mind using the old version, and you actually have need for Office, then I guess you could buy it?