There's Scot Ranney's website www.LearnJazzPiano.com that has contributions by many pro jazz pianists (myself included). Scot does live skype lessons too.
And if it's actually Skype that you're interested in (rather than links to articles) you can't go wrong Dave Frank as a live jazz piano teacher: http://www.davefrankjazz.com/skype/skype.html
I don't do lessons via Skype yet - only by telephone, but I have a bunch of gratis articles on jazz piano here: http://piano-lessons-riverside-ca.com/lessonshome.html
The incredible jazz pianist Doug McKenzie has published hundreds of instructional jazz piano videos: http://www.bushgrafts.com/jazz/home.htm. Doug is an amazing player as well as a great teacher!
Best of Luck!