I'm looking at my D2 now, and I've got to say, I'm very surprised at the omission of front-panel audio I/O. I suppose it goes to show that as a reviewer, I can't simply take anything for granted. If I'd noticed the lack of front-panel audio at the time of my review, I'd certainly have had something to say about it.
One possible course of action is to let the front panel audio from your PC be fed from the onboard sound card. Some programs, like Teamspeak, let you use an audio source that's different from the PC's default audio device. And like Kougar mentioned, you could always pick up a set of speakers that provide headphone pass-through output. Many sets in the $75+ range have the feature.