[bubblethink]

I don't think OMSCS is that selective. Get a couple of letters from your former professors and/or bosses. Letters are supplementary, not the sole determinant. More than the letters, they likely care about your GPA and GRE.

[Jtsummers]

They don't even require the GRE. They have a very high acceptance rate but a pretty low completion rate.

[sthu11182]

Last time I heard (like 3 years ago), the acceptance rate was 80%. The completion rate is much lower.