We have a growing Portal at the address www.softwarepublico.gov.br, where we also host the Brazillian OpenACS community. By the way, it has now almost 700 members and in the first community meeting there were about 20 people.
I gues the website size is really relative, because you can say you have a lot of users, a lot of acs_objects, etc. As the first idea is to measure the users number, 100000 looks like a lot of people to me (as you guys at UNED have).
So, concerning the users number, UNED wins with 105000?