Me too.
He may have been in Boulder - he didn't have to live there to go there.
Was he interviewed for a job, using the "holidays" to travel there?
Does he have friends or family there?
Does his wife? (it sounds like he was still with his wife back then, but probably only had one toddler at the time)
Something's tying him in - to the point of reporting a "confession". Did the DNA collected for allegations of a sex crime (in CA???) wind up being compared to the Ramsey DNA? Did he feel cornered and "confess"?
I don't know.
But, I do find the wording interesting - "confessed to certain elements of the crime."

... one law enforcement official told The Associated Press that Boulder police had tracked him down online

... Karr had been communicating periodically with somebody in Boulder who had been following the case and cooperating with law enforcement officials.

... the Ramseys gave police information about Karr before he was identified as a suspect.

... Karr was initially taken into custody in Bangkok on unrelated sex charges. But Thai police Lt. Gen. Suwat Tumrongsiskul said he was unaware of any criminal charges the suspect faced in Thailand.

... Thai police said Karr was arrested at his apartment in downtown Bangkok at the request of U.S. officials, and was being held until they arrived. Suwat said he expected U.S. officials to take Karr back to America in the next few days.

Wood said he and the Ramseys "have been totally amazed and impressed with the professionalism of law enforcement" under Lacy's direction. Lacy became district attorney in 2001.

Lawrence Schiller, author of the 1999 book "Perfect Murder, Perfect Town" about the case, said Wednesday he understood the man had been on a list of sexual offenders who were suspects for a long time.

"There are a lot of facts about her actual death that the public does not know." Schiller said. "If he did confess to some facts of the murder, to reveal those facts of the case, that would finish the puzzle."

Among the facts he said were not generally known was the murder weapon and what the killer did with it. ??? Interesting

http://www.newsday.com/news/nationworld/sns-ap-jonbenet-ramsey,0,3333636.story?page=2&coll=ny-football-headlines