This is rather exciting news. It seems the unreleased ASUS 1004DN netbook has cleared FCC certification and might be poised to be released by ASUS.
Unlike other netbooks (even the SX3), this one features a built-in optical drive and the new N280 Atom CPU. No price is given yet, but it might be demo'd/featured at CeBIT 2009. So keep your eyes out on more pictures about this netbook.
I'm speculating that it might be as affordable as $600 given it is part of the EeePC 1000 series of netbooks and that past 1000 series netbooks have cost around $400.
If you're seriously considering a netbook now, I'd wait until this thing is priced and released. That way you'll have a choice between no optical drive or with a optical drive.