No I don't think it's Szabo or anyone else whose name is known to me. I explained why I don't think it's Szabo to a reporter from London's Sunday Times who wrote about it in the March 2 issue. I'll try to find and quote the relevant section.

I had the article jailbroken recently, and the relevant parts (I hope I got it right, my version has scrambled-up text) are:

Nonetheless, the original bitcoin white paper is written in an academic style, with an index of sources at the end. I go to Wei Dai, an original cypherpunk, the proposer of a late-1990s e-currency called b-moneyand an early correspondent of Satoshi. When, in the first of several late-night chats, I ask him how many people would have the necessary competencies to create something like bitcoin, he tells me:

"Coming up with bitcoin required someone who, a) thought about money on a deep level, and b) learnt the tools of cryptography, c) had the idea that something like Bitcoin is possible, d) was motivated enough to develop the idea into something practical, e) was technically skilled enough to make it secure, f) had enough social skills to build and grow a community around it. The number of people who even had a), b) and c) was really small -- ie, just Nick Szabo and me -- so I'd say not many people could have done all these things."

A sudden frisson. Szabo, an American computer scientist who has also served as law professor at George Washington University, developed a system for "bit gold" between 1998 and 2005, which has been seen as a precursor to Bitcoin. Is he saying that Szabo is Satoshi? "No, I'm pretty sure it's not him." you, then? "No. When I said just Nick and me, I meant before Satoshi" So where could this person have come from? "Well, when I came up with b-money I was still in college, or just recently graduated, and Nick was at a similar age when he came up with bit gold, so I think Satoshi could be someone like that." "Someone young, with the energy for that kind of commitment?" "yeah, someone with energy and time, and that isn't obligated to publish papers under their real name."

...I go back to Szabo's pal, Wei Dai. "Wei," I say, "the other night you said you were sure Nick Szabo wasn't Satoshi. What made you sure?" "Two reasons," he replies. "One: in Satoshi's early emails to me he was apparently unaware of Nick Szabo's ideas and talks about how bitcoin 'expands on your ideas into a complete working system' and 'it achieves nearly all the goals you set out to solve in your b-money paper'. I can't see why, if Nick was Satoshi, he would say things like that to me in private. And, two: Nick isn't known for being a C++ programmer."

Perversely, a point in Szabo's favour. But Wei forwards me the relevant emails, and it's true: Satoshi had been ignorant of Szabo's bit-gold plan until Wei mentioned it. Furthermore, a trawl through Szabo's work finds him blogging and fielding questions about bit gold on his Unenumerated blog on December 27, 2008, while Satoshi was preparing bitcoin to meet the world a week later. Why? Because Szabo didn't know about bitcoin: almost no one outside the Cryptography Mailing List did, and I can find no evidence of him ever having been there. Indeed, by 2011, the bit-gold inventor is blogging in defence of bitcoin, pointing out several improvements on the system he devised.

I actually meant to email you about this earlier, but is there any chance you could post those emails (you've made them half-public as it is, and Dustin Trammell posted his a while back) or elaborate on Nick not knowing C++?

I've been trying to defend Szabo against the accusations of being Satoshi*, but to be honest, his general secrecy has made it very hard for me to rule him out or come up with a solid defense. If, however, he doesn't even know C or C++, then that massively damages the claims he's Satoshi. (Oh, one could work around it by saying he worked with someone else who did know C/C++, but that's pretty strained and not many people seriously think Satoshi was a group.)

* on Reddit, HN, and places like http://blog.sethroberts.net/2014/03/11/nick-szabo-is-satoshi-nakamoto-the-inventor-of-bitcoin/ or https://likeinamirror.wordpress.com/2013/12/01/satoshi-nakamoto-is-probably-nick-szabo/ (my response) / http://likeinamirror.wordpress.com/2014/03/11/occams-razor-who-is-most-likely-to-be-satoshi-nakamoto/