Last night, at the Colorado Young Dems reorg, Jim Polsfut spoke about his burgeoning Congressional bid, and all but announced that he was running. He's setting up a website, hiring staff, and doing a "listening tour" of the district, and the letter he was circulating there (which you can see here: Download jimletter.rtf ) basically stated that he was the only candidate who could mount a winning campaign.
Personally, while he seems to have an engaging personality, he does have a slightly squeaky voice which wears on you after a while. And I'm agnostic on whom would make the best candidate in a seat which will be a top pickup opportunity for Democrats in '06. The way I look at it, Perlmutter seems to be diffident at best, even though he's the only serious officially announced candidate. Polsfut, from what I can gather, has been a lackluster candidate. Carroll is still a bit raw for my taste to mount a tough campaign in a key district (one speech does not make for a contender, especially when the speech wasn't all that great to begin with), and Conti has a better shot as a Green.
UPDATE: One of the complaints that's been lodged here against a Polsfut candidacy is that he doesn't live in the district, which presumably would make his candidacy a tougher proposition. On a hunch, I decided to look up the address he has listed on the letterhead of his literature. You guessed it--it's in the district.