This looks like one for those of us who can't work out what we're doing :-) Actually, it is more useful than that and I think worth a read.

I agree this has to be collaborative!
There is no direct way that I'm aware of for linking the #phdchat sessions directly with Diigo, but we can each take individual responsibility for entering resources we mention in Twitter to the Diigo group.
The other nice feature of Diigo is that when we enter a resource, it is possible to have a threaded discussion about that resource.
I guess we should also make a link to the Diigo group page from the wiki once we have that running properly.

We'll no doubt work it out as we go along :-)