Stumbleupon is great, but like Digg it's too general. One of the great things that Priscilla's list did was to foster a sense of community amongst the PD bloggers. That feeling is significantly diluted on a site such as Digg or Stumbleupon because it's clearly not just about personal development (and related topics).
Also, I can't seem to get Stumbleupon to show a browsable list (other than the few top pages for any specific tag). In other words, it doesn't provide the service Priscilla's list does, in any form (that I'm aware of). Digg can through its search, but like Stumbleupon it focuses on individual pages.
But that's just my opinion.
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