I’ve covered‘s data roaming before, but in the last day or two they have improved the deal. Whereas before you could get 5MB per day of data roaming (within Europe, for £2/day or £10/month) they have now increased the limit to 25MB per day. This makes the offer even more appealing, as most people are capable of keeping their phones below 25MB of data per day; before the 5MB per day limit seems designed to prevent accidental use of roaming data, but at 25MB per day I think it’s now designed to be actively used.
A few warnings and conditions of course; it’s opt-in (although recent PAYG users are automatically offered the service); without it the rates are higher, so well worth checking you have the facility. Outside of Europe, the cost is higher (£5/day with no monthly deal), and the costs are higher again for laptops / tablets. However, if you have a recent £40/month or higher contract (often including 900 minutes or more) then you may actually get Data Traveller included with your contract (this also applies to SIM only contracts).
Thanks to Ben Smith at Wireless Worker for spotting the new tariffs.