Felipe Banados, one of the attendees of Smalltalks 2010, talks about the experience:
It has been quite a week. The experience of being at Smalltalks 2010 in Argentina was beyond any expectations I might have had. ¿The reason? It wasn’t only the keynotes, neither being in another country for the first time: It was because of meeting and feeling a part of the smalltalk community.
Sounds a lot like ESUG to me - and that's a good thing.