Many gamers were less than impressed by the lack of a UMD drive for the latest PSP model. Although the handheld offers some rather nifty improvements on the 3000 model, avid collectors of PSP titles found themselves with a large collection of games that would be essentially useless, should they choose to upgrade. Sony also offered very little compensation with this issue.
Today an unnamed source told CVG that Logitech were working on an external UMD drive for the PSPgo. Although this would be quite a cumbersome addition, it would be a welcome addition to gamers who are wary of upgrading, not wanting to lose their back catalogue of UMD games.
When CVG contacted Logitech’s UK office about the potential add-on, they responded with;
“We’re not aware of it, so it may be something the US office is working on.”
Sony are yet to issue a response confirming or denying the rumour.
Article from Gamersyndrome.com
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Sean Young is a writer...that or some sort of utensil. He forgets which. He provides content for several websites as well as writing poetry and prose, some of which is published. Talking about himself as if he wasn't in the room makes him feel paranoid. You can follow his video games related writing at malfesto.blogspot.com. 
really? I think the UMD sucks the life out of your PSP. With Flash memory you can get 8 hours play time but with UMD its more like 2 hours.
I’ve got quite a collection of UMD games and I’m not really willing to part with them for what is essentially more of a step sideways than forwards. That bit of extra battery would probably be nice but I just don’t think it’s good enough a return for sacrificing all of those games. Assuming the external UMD drive is reasonably priced(and exists), it would help sway my decision. I could start going digital, whilst not losing an expensive collection of software.
yes if you are going from another psp with UMD to the PSP go then thats a different story, the only difference that makes any difference is the 8GB built in memory and the layout/design of the units.. im not happy about the GO having a smaller screen then the psp 3000