Did this help any? I started noticing my battery running down way more than it should, I checked what was using data and Android OS has used 1.53 gigs in the last month, which it have never done before. I have one seach widget and the usual HTC clock and weather, I have "backup and restore" off.
The only widget I have now is the HTC weather/clock one and OS services is still taking a couple of megabytes a day on mobile internet so it's still a bit of a mystery. When I have my WiFi on it uses about 12mb a day so it obviously must be something else. General syncing maybe?
On closer inspection 'OS Services' seems to consistently take about 80-160kb per hour, other notable culprits include Sky News which takes precious Kbs even when I've turned off background updates, Google+ which I can't seem to turn off updates for and the elusive 'Other'.
Give Norton Utilities a spin! It not only gives Data Usage details but will also give you battery usage details and app resource consumption details. I really like it. The free version is pretty powerful, but I like the pro-version for the profiles and the auto-kill.