According to http://rjharris2012.com/, Harris won a straw poll of attendees at the recent Illinois LP state convention (revolving story at the top of the page, I see no way to link to the story directly). The site also has video from that convention of Harris debating fellow candidates for the Libertarian presidential nomination: Roger Gary, Lee Wrights, Carl Person, and Bill Still. The video was also supposed to be live, but from what I have read there was a glitch. However, it appears that it is now available.
Harris was also at one point leading in an internet straw poll at LPMNDC.org. However, as of this writing it appears that Jim Burns has jumped back ahead. The current numbers are:
R. J. Harris
John M. Finan
According to the latest update of presidential candidates at LP.org, Gary, Harris, Person and Wrights are the candidates filed with the FEC, along with James Ogle (who is not listed as having a campaign website).
The non-FEC filing candidates listed are Burns, Waymire, Robert Milnes and Bill Still. All of those except Still are listed as having campaign websites.
Of the remaining candidates in the LPMNDC poll, Wayne Root says he has not made up his mind as to whether he will run, although other people widely regard him as a candidate. Keaton announced a candidacy for 2012 back in 2008, but has since stopped her active involvement in LP leadership (and possibly the party as a whole), has not actively pursued the candidacy, and it appears that the announcement was likely to have been either a joke or that she has thought better of it. John Finan was a candidate for the 2008 nomination; if he is running again this time, this is the first I can remember having heard of it.
Also, at one time the poll listed Tom Knapp, who was previously an announced candidate for the nomination but has now quit the LP and electoral politics and had his name removed. He had some votes in the poll prior to being removed; I don’t know what was done with those votes.
Other candidates who had at one time been running for the 2012 nomination include Michael Jingozian, who has since announced that he will not run, and Jim Duensing, who may or may not have dropped out (I have been unable to find out for sure).