There's actually some benefits right now to getting a retail over OEM.
1) Its only a few bucks more expensive, and in Newegg's case, sometimes cheaper (by a lot for the 2500+ Barton).
2) The retail chips are currently coming back with better/later steppings than their OEM counterparts. Many 1700+s are coming back as T-bred As. In the past tray inventory has turned over much faster than retail boxed chips, so the newer steppings were found on OEM parts. That hasn't been the case as of late.
3) You get a crappy fan, which can be good as a backup or free sink on an older CPU.
4) You get an AMD case badge.
5) You get 3 years instead of 30 days warranty.
I should have my Barton Retail 2500+ Thursday if Googlegear ever decides to go from "Packed" to "Shipped." First retail AMD I've ever bought.
Chiz