At Harvard (like most US institutions), Harvard pays us a "9-month" salary; we can earn 3 additional months "summer salary" by various means, including grants. For example, you can use NSF grants to pay up to two months summer salary (the 2 months is an NSF limitation -- the 3rd moth would have to come from somewhere else).
When I arrived at Harvard, I found it a little odd that the 9-month salary was distributed over the 12-month year, but the summer salary was all paid over the summer. What this meant is that if you took 3 months summer salary, say, you got paid almost 1/2 (well, 7/16, I think -- consider this a good word problem for your average high-schooler) of your annual salary over the 3-month summer. But I got used to it.
This summer it appears the practice is changing, with summer salary now being set to be distributed over the 12-month financial year. There is some nominal loss (for me and other faculty), in that the money we were going to get paid this summer will now be paid over the 2008-2009 academic year, costing us potential interest. I'm actually also concerned about what havoc this could eventually play with taxes, although with any luck there will be nothing significant. I suppose I'll get used to this as well, but I don't see it as a good thing.
Inside sources have suggested to me that this is part of a move to better keep up with compliance issues for federal grants, inspired by the fact that Yale is apparently currently under an unpleasant government microscope. A quick perusal of Google didn't shed any useful information on Yale's plight, and I'm not exactly sure why the change in practice would make a difference. Anyone with similar stories or insight is welcome to comment...