I have found some source code for an online wallet that looks like it might be good for us to mod over to Peercoin.
Source code is here https://github.com/FuzzyBearBTC/webtc
Feel free to make any pull requests if you fancy having a go at making this online wallet yourself, I will add this to my todo list and see what I can come up with. I will raise issues in github as and when I find areas of dev needed.
Fuzzybear