I think the major comics publishers (and quite a few of the smaller ones) see the writing on the wall, and want to get into the digital market. Unfortunately, they are saddled with a market that has not stabilized on a platform or delivery system, and they do not have the resources to impose one on everyone. So they are trying out various low-cost methods (like the Marvel DVDs), watching the other content delivery systems (
zinio.com, for instance, may turn out to be a delivery method they could take advantage of), and hoping they make the right decision.
As to what to buy: Right now, if you have the resources, you're probably better off with a laptop (or a UMPC), capable of handling multiple formats plus PDF and flash, to get the most possible number of formats for e-book delivery. Any dedicated reader will either severely limit you in what is available, or will require you to do your own (mostly manual and time-consuming) conversion, a process I wouldn't recommend.
I know I'd love to get my collection of comics and GNs into digital formats. But the idea of doing that manually is simply ridiculous right now.