I left my old corporate job, with its lovely 401(k) that offered cushy matching funds, in 2005.
The year after was such a financial disaster -- I piled on credit-card debt like, well, a sailor on shore leave with a fistful of credit cards -- that I didn't make any retirement contributions at all.
But now, I am doing my 2007 taxes, and (huzzah!) I get to be responsible again. That means I'm making a contribution to my retirement funds.