I have a theory related to dice sites, and how actually you can take advantage of it in reality. I have tested Primedice and actually it turns out that the rule of the average applies to it.
Briefly- in 20 thousand rolls your average sum number is more or less the same as in 500 rolls- Fifty (+-2%). And That is a Fact.  So, theoretically if you have couple of dozen of rolls which differ from the that average number (the law of the large numbers, I believe it is called) you know that this is going to change in order to compensate the average... What you don't know- is it going to be in the imminent future or it is going to be largely spread over time. However- analyzing your bet history might be interesting thing to consider, if you want to give your luck a little boost. And a smart script analyzing bet history would be an interesting thing.