nice thread
I found
this list of obscure sequels on another site
some of the ones on it not yet mentioned in this thread:
CARRIE 2: The Rage (1999)
LOST BOYS 2: The Tribe (2008)
CARLITO'S WAY 2: Rise To Power (2005)
S DARKO (2009)
sequel to DONNIE DARKOROADHOUSE 2: Last Call (2005)