I support what Wikileaks are doing, though I think that there should have been more care when making some of their releases. But I do have my doubts about Assange.
He strikes me as being a narcissist, and is controlling the flow of information to increase his own importance. For example, he was hinting at huge revelations that don't seem to have been released. Weren't there some earth shattering secrets on the banks due out a while back? I haven't heard anything yet.
In a sense he's becoming bigger than Wikileaks, rather than being an integral part of it. And having been compromised by events in Sweden, he's probably damaging the organisation's mission. If he had a slightly lower profile, maybe being more of a figurehead than defining figure, he'd probably do more good.
I don't know how serious the charges against him in Sweden are, but basically the women involved agreed to have sex provided a condom was used. Assange was unwilling to do so, which breaks the condition under which consent was granted.
I'm not convinced that the US will extradite him. A big trial would allow him to be portrayed as a martyr. The claims that he'd face the death penalty are hot air, as the treaties that govern the process don't allow a European government to hand someone over if this is a genuine threat. Oh, and there would need to be agreement from both the UK and Sweden for him to be sent to the States. It'd be easier to ship him direct from the UK.
If he's charged in Sweden then his reputation is damaged, and a conviction would destroy it. That's a much lower risk strategy for the US government, and it falls into the hoist by his own petard category.