of those one-hit 'post-millennial britpop' bands that popped up around the same time as Franz Ferdinand and Arctic Monkeys. I don't know why, exactly, I'm doing it, but I want a complete list and I figure the DiS-ers would remember it a bit better than I, what with me being from the States and all.
Here're some of the acts I got, some of which may have had more than one hit but really won't be remember much out of the scope of 'hey that's one of those bands that wanted to be Franz Ferdinand (Franz who?).'

Go:
Dogs Die in Hot Cars
Razorlight
The Dead 60s
Good Shoes
Rakes
Clor
Maximo Park
Good Shoes
Fratellis
Little Man Tate
White Rose Movement
Pretty much anyone who worked with Paul Epworth
Kasabian
Radio 4
Hard-Fi
Editors

Some that are a little more questionable (or I don't know much about):
Mystery Jets
1990s
The Sounds