The only annoyance for me comes during games. Last night I got a text while playing Bejeweled (I know, stupid game but for some reason extremely addicting for me). Paused the game, answered the text, and when I came back to the game it completely reloaded instead of returning to where I was paused. I haven't tried other games under that scenario yet so I don't know if it's game specific or the OS.
Lesson learned I guess is to make sure you're at a good stopping point that can be recovered before leaving a game to do something else. Although my daughters Optimus S, in all its single core, 600 Mhz, 512 MB RAM, pink leopard print encased glory can deal with the above scenario just fine.
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