http://news.aol.com/political-machine/2008/03/24/aol-straw-poll-march-24-31/ This gives a lot of food for thought. First of all although it is tagged as being unscientific I think it is quite accurate. It has literally hundreds of thousands of respondents as opposed to regular opinion polls which have several thousand. Also the figures seem to tally well with recent primary results ( Ohio and Texas for example).
My hunch is that it actually understates Hill's support as her voters would generally be less 'internet intense' than BHC's as anyone familiar with the blogosphere can testify ( a higher proportion of elderly, unemployed etc). Plus, let's face it, the other lot are more liable to have a higher proportion of fanatical 'multiple' voters.
If so it is good news for Hill looking at their figures for the remaining primaries. Even North Carolina shows her with a slight lead - this actually pretty well tallies if you configure her getting 10% and 70% of the black and white vote respectively.
The other point that sticks out is that they are practically even stevens in Michigan which means that a revote there probably wouldn't make much difference.