Well the problem with the "open source" claim of the EasyUO people is that it won't really be OPEN. When I think of open source, I think of code that I can compile, tweak, etc. They are wanting to release a *CLOSED* dll/lib that people can interface to.
So I say nay to the OpenEUO(*cough*) initiative since I don't want to rely on a closed source. I have much more faith in the UOAI project since that code is freely available, but at this time is only in beta. I have already played quite a bit with the UOAI project with SUO and I feel that when UOAI moves from beta to release status, we can really take advantage of it.
Edit:
(lol, yeh Xclio, what you said!)