Active SSI Project

I've looked around on the web a lot for HPC clustering 
solutions, and I was drawn to OpenSSI because it looked like the 
best of what I've seen.  But this mailing list barely sees any 
use at all, and the project doesn't seem all that "alive".  In 
fact, none of the HPC clustering projects I've looked at seem 
all that active.  Can anyone suggest a good one?  I'm ideally 
looking for something that...

1) Stays current.  (That is, it's up to date.  It doesn't refer 
to Sarge as "testing", etc.)

2) Provides a true Single Server Image (like OpenSSI).

3) Is as working and bug free as can be reasonably expected. 
Something on the level of the stability of the major Linux 
distributions.

OpenSSI seems to have the best combination of the three from 
what I've seen, but it's still not quite the level I was hoping 
to find.

Thanks,
- GM

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