Good idea, I like the sound of that. Not wishing to put too much work, but I would be curious about more stats of the primes too, e.g. quantity by project, rank range...
As for the 100th megaprime, I'm in for trying for that. If things don't get too warm I'll put some boxes back on again for now.
Out of interest, how does credit work for projects on T5k? For example, I know for individuals, if multiple are listed they share the credit. But for software, regardless of how many are used, they all receive full value. How do projects fit into that?