Myself and BurnleyMik are mods on a UK based Poker forum (actually Mik owns/runs the forum).
There are some professional players who post on the forum who obviously have a great deal of money on the sites in question, some of them have 5 figure sums.
If you have money on the sites don't panic too much as I know of at least one player who has withdrawn a 5 figure sum from Full Tilt post 'Black Friday' and the money has hit his bank account. He is still pending a withdrawal from Stars but that is showing as pending and he is confident he will receive it. He has left a working roll on both sites as, in his own words, the games at the moment are as 'soft as poo'.
This is a good read
Online Poker Industry Black Friday ? Bill's Poker Blog