my CPU is ATI 1950GT

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[First: Folding at home uses GPUs, but the client is far from easy to install. But you probably know that already.]

On the topic itself: As far as I know one of the biggest problems standing against running Rosetta on GPUs is that Rosetta is developing so quick. Each client has to be programmed and beta tested to ensure there are as little problems as possible. Both takes its time.

This also the reason why Rosetta does not only have no GPU clients, but also no clients optimised for Intel and AMD CPUs separately, which many other projects have. The more clients you produce the more development time has to be spent on coding and testing.

And as - as I have said - the people at Rosetta enhance their client pretty often and have very limited human resources for programming and testing they stick to the number and kind of clients that are currently available.

Unless the Bakerlab people do not get access to additional resources or get the rosetta project into a phase where enhancements become slower because they are kind of nearing a "perfect" folding algorithm, this will probable remain the state of things.