Congressman Mark Foley (R-FL) planned to resign today, hours after ABC questioned him about sexually explicit internet messages with current and former Congressional pages under the age of 18.A spokesman for Foley, the chairman of the House Caucus on Missing and Exploited Children, said the congressman submitted his resignation in a letter late this afternoon to Speaker of the House Dennis Hastert.
Hours earlier, ABC News had read excerpts of instant messages provided by former pages who said the congressman, under the AOL Instant Messenger screen name Maf54, made repeated references to sexual organs and acts.
The full details will be included in a report tonight on ABC World News with Charles Gibson.

From DailyKOS:

After issuing a flurry of self-righteous, outraged denials last night, Mark Foley is resigning from Congress today after realizing that he won't be able to stop the full exposure of the extent of his inappropriate and predatory advances towards current and former Congressional pages under the age of 18. That a Congressman would abuse his position of authority to make predatory advances to 16-year-olds is one of the most shameful stains on political office imaginable. This requires more than a resignation. This requires atonement.
In the comments section at Swing State, Democraticavenger points out that Mark Foley's campaign cash will likely find its way back into the National Republican Campaign Committee's coffers, much like how former CA-50 Rep. Duke Cunningham spread his campaign cash before he began his prison term. If Foley had any sense of remorse, or any sense of shame, he would surrender all $2.8 million of his cash-on-hand (Aug. 16 numbers) to charities for exploited children.

Excerpt of some of the IM's. They're way too graphic for me to reprint but here is the gist:

Maf54: You in your boxers, too?
Teen: Nope, just got home. I had a college interview that went late.
Maf54: Well, strip down and get relaxed.
Another message:
Maf54: What ya wearing?
Teen: tshirt and shorts
Maf54: Love to slip them off of you.
And this one:
Maf54: Do I make you a little horny?
Teen: A little.
Maf54: Cool.