Excellent point Hmmm_Greenie!
What I have found is that the Superdrive, while requiring more current than the typical USB port, the Superdrive's current while reading is not that much, it's when you fire up that laser to write a DVD that the current is peaked. I have no problems reading CDs while I'm online.
The nice thing is, the EVDO Card doesn't use very much power when it's dormant, so simply logging off (And turning off auto connect) I would imagine you'd be able to burn a DVD just fine. I haven't tested it, though I probably will, and I'll keep this thread updated!Another thing I have found, is that the USB ports have limited overload protection.
From what I understand, they are designed to cut out of there is too much power draw (I've seen this in Windows, a little error pops up "Power Surge on USB Hub").But as far as the CD-Rom running to install programs? Not a problem at all.
The closest I've seen are the Cradlepoint WIFI routers. http://www.evdoinfo....t/view/2301/64/
You will find they offer a batter powered model, which converts your EVDO or GSM card into a portable Wifi hotspot. I actually used the MB800 in my car for a time, broadcasting "Listed1st.com Mobile Wifi" everywhere I went.
Problem is, it was not reliable enough for me. Very often the CDMA card had disconnected, I'd open my Macbook for a presentation and have no net. I'd have to log onto the router, reset the connection, then proceed with my presentation. not very suave. But if that's not an issue for you, it's your best bet.
No matter what, it seems bluetooth devices tethered don't perform nearly as fast. I was reading some of the comments on the different website hosting my mod, and it was mentioned that most bluetooth phones, for example, are EVDO Rev 0, not Rev A or B (The faster type) so speed is limited considerably.
I don't see why it wouldn't be possible, the only thing stopping anyone would be the size of the USB cards. I'm afraid I didn't research the different cards, so I wouldn't be of any help there!
The only other way possible I see to do this mod would be to remove the speaker unit (It's on the opposite side, full height of the battery)