The Programming Systems Lab at DFKI is developing Oz a very interesting concurrent constraint system.
The Computer Science Department at Uppsala University is working on Reform Prolog . A recursion parallel implementation of Prolog. The have shown very good figures on there system that is available for research purposes.
A good article on implicit parallelism in Parallel Haskel
Efforts to parallelize C is also done at MIT in the IPC project.
The CC++ system developed at Caltech is interesting since it uses a to the write once variable as the means for synchronization. Read more about CC++, Fortrand M and Nexus.
Other pointers that might be useful: