As of this writing we have: (thanks to Chip for his valuable input!)

Palin's membership in an apocalyptic, militant, neopentecostal dominionist movement called Joel's Army  (unless she repudiates the group, which is unlikely, this could be an extremely serious liability!)

Palin's membership in a radical right stealth group called "Feminists For Life"

Palin's apparent sympathies for and possible connections to the Alaska Independence Party, a secessionist group

Reports that Palin used a government "per diem" allowance to charge her state for more than 300 nights spent at home and spent another $43,490 on travel for her children and husband.

A brewing scandal involving her firing of a police chief: Troopergate aka the impending "October Surprise"

The revelation that Palin's 17-year old unwed daughter is 5-months pregnant (not likely to appeal to evangelicals who prefer abstinence to unprotected teen sex)

Brewing mini-scandals like "Broken Water-gate"

A news interview in which Palin asks, What is it that the VP does anyway?

Reports that she has made many enemies of both parties in the Alaskan state legislature

Reports that she is a poor administrator

The news (from Stephanopoulous) that she was for the Bridge to Nowhere before she was against it.

Her assertion that "the founding fathers" put "Under God" in The Pledge of Allegiance

Her implication that energy independence can be achieved solely through domestic drilling.

Her questionable involvement with a 527 group for Sen Stevens

Palin's earmark requests: more per person than any other state

Clearly, this is not a candidate who was well-vetted, let alone qualified for the job of VP.

If this doesn't reflect on McCain's poor judgment, and his sense of desperation, then I don't know what does.