What sort of stories/settings are they and how are you finding it?
I am/was playing in three also:
Coldrinnick Manor, which is pulp horror, high on tone, with a good group of people
An Astonishing Adventure, steampunk, also a fun group of people, but we appear to have stalled
Eye of Truth (retired), pulp horror, which I ended up retiring from because it never really gelled as a story--the narrator wanted to give each character a separate story of how we got involved in the horror, but that meant that there wasn't a lot of interaction between us.
Surely other EA folks have joined?