So, how much of this money is only pledges that never pan out?
None. This is all just online donations.
If you keep checking, the following graph will update dynamically. Ron Paul's campaign has followed Fred Thompson's prescription for campaign finance reform and posts fundraising totals live and you can catch the names and locations of the donors too.
You can find forty different live-updated fundraising graphs at:
RonPaulGraphs.com - Q4 Donation Statistics & Stuff
Ron Paul will pass $1.6M in a few minutes with only half the day over.