yeah Cemetech is very active, altough there is a lot off-topic stuff compared to ti calcs (thats one reason why I left UnitedTI) but sometimes there is lot of interesting stuff and I visit often to see your updates and programming help section.
Maxcoderz is the most active english TI forums I think (5-100 posts per day), but its not as open to TI-BASIC stuff as cemetech, Omnimaga, EPS, UTI and such groups.
*preparing to post news article + poll*