The BBC and various commentators seem to be working themselves up into a froth of expectation over the resignation of Smith and Blears, forseeing all sorts of machiavellian manouvering in their actions - I think it is far simpler and Gromit has the right of it.. both Smith and Blears knew fine well that they were going to lose their position in the reshuffle, knew they wouldn't be offered another, and so elected to jump before they were pushed.
Hoon and Darling are different in that they may well feel they still have a place in the cabinet and so will wait and see.
I can't see an internal leadership contest even in the worst of all possible meltdowns for labour that may happen in the european and local elections - Once maybe back in 2005 when Brown got in, but I dont think they could do it twice without going to the country.
Brown will do his level best to hang on I think until the latest possible date, hoping that the economy will recover and that the expenses scandal will go away.
The oppostion have a day to table motions next week, and I think Plaid Cymru and SNP(?) are both tabling a motion to dissolve parliament, but I doubt they will get sufficient labour mps onboard to get the motion to pass.