Oh, and here is one more very pretty picture of both cluster and nebula, from the Aladin deep sky atlas and database (it is a DSS image; don't worry about the strange colours, as they have no accuracy whatsoever)
The general appearance is a little bit reminiscent of the NGC 3603 field.
For those of you crazy about clusters, like Dana, here is a very good and very clear review paper about the Initial Mass Function of stars. It is very detailed, but remarkably accessible for enthusiastic non-astrophysicists like us:
_____IMF_(Kroupa)____[P.Kroupa__2002__Science__ Vol.295__p.82.pdf