Cuda means Compute Unified Device Architecture, see [L1 ] or [L2 ], and is in essence a small supercomputer on a modern graphics card (of NVidia, but hey, they've pretty well available). In fact There's also Tesla, based on simular computing nodes, which preferably in version 8 (with hardware double precision floating point units) can make supercomputing workstations with over 4TFlops of power for unter 10k$.
Cuda already has a perl interface IIRC, handy to play around with.
TV himself currently has not done anything with Tcl/Cuda yet, but wants both scripting with cuda programs and a parallel Cuda implementation of tcl (at least in some academic form to play with).
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