That's not an easy answer, IMHO.
The current flurry of activity is most likely due to
a) the time of year (Spring buying)
b) lower prices
c) historically low interest rates
d) $8,000 1st time home buyer credit
that's an unprecedented combination of factors.
Homes that were priced aggressively have sold near, at, or sometimes even slightly above asking prices (yes, I've seen a number sell above asking price!). There are still plenty of sellers out there who won't lower the price to where it should be - either because they don't want to accept market conditions (not MY house!) or for financial reasons, i.e. they owe close to or more than the market/buyer will pay.
I do believe we're near the bottom, but even with all the activity, short term, increases will be an exception, IMHO, if only because (as you mentioned) we have such huge inventory of homes on the market - and the listings keep coming.
I believe I've said it before, if you're going to buy (not for the short term!), do it now! If you want to trade up, sell and buy now - whatever you're "losing" on the selling end, in most cases you'll more than make up for it on the buying side. Interest rates are artificially low because of government intervention; that'll stop before you know it and then the rates have only one way to go... UP! If you're only selling, you'll either bite the bullet or wait four or five years...
Ok, I'll get off my soap box
