Hello,
acid-state is still alive and kicking (and better be since hackage uses it). In fact, there is a GSoC project to add replication support this summer I believe.
ixset is still supported. We submitted a patch upstream to syb-with-class but have not heard back. Our patched version is here:
Nix patches syb-with-class by default -- which is nice ;)
If you do not have legacy code to support, I highly recommend checking out ixset-typed. It is very much like ixset -- but does a better job catching errors though the type system. IxSet is a little too loose with the types for no real reason resulting in avoidable runtime errors.
- jeremy