The common theme between them is that both users had GPUMax accounts, with passwords that were either the same (as the GLBSE accounts password) or similar.
I emailed the GPUMax website yesterday (the email in their whois records as there isn't anything on the site) to inform them of this.
Since I've not seen any notice regarding GPUMax I feel that it is my responsibility to bring this to public attention.
If you have a GPUMax account it is highly likely that it's password has somehow been compromised.
If you use the same or a similar password elsewhere (GLBSE, MtGox, Email whatever) please change them now.
If you are a GLBSE user I would encourage you to use two-factor authentication, there have already been over 3 accounts which have been protected by this.
Nefario.
If the people used the same or similar password on 2 sites, isn't it reasonable to expect that they used it on other sites as well?
The question should be what percentage of GBLSE users also use GPUmax? If this percentage is very low, then Nefario is probably right.