Just went to PPS to have a look. PPS has changed. PPS has been re-structured into 5 distinct sections:PPS Pings, PPS RSS, PPS Blog, PPS Directory and PPS Wiki.
I still prefer the previous one because I found that it bring less visitors to my site. The main page of PPS only shows a few links of recent pings (without post name as well). Normally visitors will stay at first page first, if they find nothing interested, they will leave.
Anyway, great job.
PS: You still can use Default Trackback (a plugin for wordpress) to ping PPS.