Im currently working on a mobile version of a website, everything is great, works fine on an iPhone, Blackberry and Android.
I have one slight problem, not a big dea
As stated in Neurofluxation's answer you can use the css rule -webkit-text-size-adjust but beware that this can prevent users from adjusting the font size on desktop Webkit as well (see this article for more details).
In light of this it's likely worth checking via CSS3 media queries (or user agent) to be safe.
E.g.,
@media only screen and (max-device-width: 480px) {
html {
-webkit-text-size-adjust: none;
}
}