I usually am ridiculed on this board when saying this, but I am dollar-cost averaging my retirement accounts back into this market, after being heavily (~60%) in cash late last year. I expect some more dips between May and October due to seasonal weakness, but want to be dialed back up to at least 60-70% stocks by the fall.
Gradually moving stocks to cash in 2008 saved me some losses, though I still took a pretty decent hit.
I expect that others will be sick of their paltry 0.05% Money market option in their retirement accounts and look for better returns. Even the paltry 2-3% dividend of stocks in the S&P 500 will start to look good.
I anticipate that in 10 years I will be rewarded for this move.