In answer to Sharon's Question, (and I'm sure others)
There are literally hundreds of things that can change your speed.
What Browser are You Using?
Do you have Anti Virus Running
Are you on a Home Network (ie wired or wireless)
Is your line connected via a substation, or to the main hub at your ISP?
They can all affect your overall speed, and unless the results are waaay out of line, (ie Big John) then most connections should keep similar results over time.
The fact that your results (both with the same ISP) are very compatible with Milli's, shows that things are looking good.