Click on the most recent date available: 2014-Oct.
Out of the direct forks from BTC, PPC is 4th when ranked by number of forks inspired: BTC, TBX, SIC, then PPC
In my opinion PPC is the only fork of BTC to provide fundamental innovation and although there are still unanswered questions with Proof of Stake, its challenge to the Proof of Work mindset is clear by the number of forks it has inspired. (Not to mention other non-forks that borrow the stake concept like NXT and BitShares)
PPC has a history of not trying to push crappy marketing on people, instead relying on its natural characteristics to draw potential investors, developers and advocates.
Kudos!
The info listed there is pretty good too :
Peercoin's original innovation is the proof-of-stake/proof-of-work hybrid system. Like other cryptocurrencies, initial coins can be mined, but the core network is maintained by coin holders, rather than the fastest pool. Maintaining the network through the hybrid PoW/PoS algorithm reduces the risk of the Selfish-Miner Flaw, 51% attacks, and the block bloating that have been used to exploit other currencies. It also requires far less energy than generating hardware-intensive proof-of-work hashes. Proof-of-stake also does away with the ~$1 billion tax on the Bitcoin network through proof-of-work blocks.