For those that don't like Three's current coverage, or get dropouts when going from 3G to GSM in poor coverage areas, now is the time to rejoice (assuming you have a compatible phone).
As of Feb 2009, Three customers will be able to roam onto Telstra's Next G network in places where they currently roam onto GSM.
This does not mean that 3 customers will get increased coverage in rural areas, as the roaming agreement is only for areas currently covered by Telstra GSM (96% of the population, whereas Next G is 99%, or an extra million square km of coverage

)
Anyway, good news indeed is that 3 have also negotiated lower data roaming charges to be implemented as of September this year. Currently 3 customers are charged $1.65/MB when roaming onto Telstra, and this is not included in your cap value.
Hurrah! Finally, less dropouts with 3 possible data usage outside of the metro areas (depending on the new cost...).
Just thought you guys might like to know... (looking at you, Desmo)
Press release for those of you that care, in .pdf format.