Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_2 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7D11 Safari/528.16)
I tried both the available memory and date on status bar. I found both to cause resprings whenever I used the free up memory feature in SBSettings. Needless to say I turned both back off.