PGI have released version 9.0 of their Fortran and C99 compilers which includes the PGI Accelerator™  support (effectively x86+GPU). PGI are making some grand claims for these extensions but without having used the tools for myself I am doubtful that they are quite as all singing and dancing as PGI are making out. The Programming Model whitepaper does address some of the critical aspects of porting software to work effectively on heterogeneous system (which is less about the compute and more about data movement and maximising bandwidths once on the accelerator) but it also serves to mask an important factor that is currently a sticking point for many people exploring the use of heterogeneous systems; that applications written for x86 may not be the best starting point for best performance on accelerators.

Update: Incidentally there is quite a bit of information on the PGI web site and a solid series of articles by Michael Wolfe published on HPCWire.