Buzzcocks did it brilliantly - coming back with a really strong album of brand new songs "Trade Test Transmissions" - most of the material matched (if not quite bettered) some of their classic work.
I guess there was the bonus that the Buzzocks didn't really have the "political" baggage of many of the Punk Rock bands. They were writing pop gems right from the off so there were no cries of "sell out!".

One comeback I never really wanted to see was Sex Pistols, mainly because they were so very special and very much of their time. To see them on the cabaret circuit without the edge and danger is a bit sad.

http://entertainment.timesonline.co.uk/tol/arts_and_entertainment/music/...
The Inhuman League, methinks.......

short lived (and who saw that coming eh?) reunion tour was a pretty blasé bit of coin grabbing while they still could. Take That managed it - but then they were fairly fondly remembered and could cut it live. The absolute highlight of the Spice Girls' reunion was the excuse for packing it all in early: 'To spend more time with our families'. That'll be the families that you have taken on tour with you and are parading around on stage every night then. Still, scans better than 'it turns out people weren't bothered after all'.

Could the coin - finally, after all these years - have dropped?

Didn't they release an album called 'Jordan : The Comeback'? I'm still waiting for her to go away.