It's interesting - the weekend and Monday polls seemed to have the LibDems fading, but most of today's polls have them back to being neck-and-neck with Labour, although most still have them only tied or slightly lower.
It'll be interesting to see what happens there. In past elections, polls usually overstate Labour support by a couple of points, and understate LibDem support by a couple points. But it's very conceivable that some of the air could go out of the Clegg bubble, especially as it remains hugely unlikely that Clegg would be in contention to be PM. And Brown has actually discovered a pulse in the last few days. The predictions of an imminent Tory govt. may cause some wavering left-of-center voters to return to Labour.
Part of that was the bank holiday. Polls over the final weekend in 2005 showed Labour up double digits, before falling back to earth. The final ICM i believe had them up 6, 38-32.