Mastercard International Runs Maestro.
It is its "debit" card brand (the equivilent for where Visa offers Visa Debit and Visa Electron)
Instead of Maestro, the names in the UK since launch have been "Switch" (for the "full" debit card) and Solo (for the "restricted" debit card)
Switch and Solo cards are therefore really just "Maestro" cards - so we've been able to use them around the world where the Maestro logo is displayed all along. Whats happenening is that Mastercard has announced its renaming Switch as "Maestro" so we're in line with the rest of europe (There has been no confirmation on whether Solo will survive or be renamed also)
Maestro logos are found in shops, whereas "Cirrus" (another Mastercard system) is found on Cash Machines - and works in a very similar way as "Link" in the UK (allows you to draw cash froma cash machine that is run by a bank other than your own)
So to summarise, in terms easy to understand....
Maestro = Switch/Solo and Cirrus = Link
Oh and the changeover DOES NOT effect your use of your card!!!
Hope that clarifies for you all
sas ~:O)