I got a comment on one of my vlogging for nonprofits posts from Devlon of LoadedPun who tipped me off to a wordpress plugin that he created for live vlog/blog pledge drives. (It was used for the HaveMoneyWillVlog project.) It allows a vlogger/blogger to add pledge drive on the blog - visitors can pledge, have it be linked to PayPal, and then have a graph show the progress towards the goal.
Now, I don't necessarily see this as a substitute for online fundraising strategy/system, but I find it interesting as a online grassroots technique. So of like the Web2.0 version of passing the hat around to friends for a personal or community cause.
There is also Chipin that is also a widget, but can be plugged into a number of other blogging and other platforms.