Another option: from your homescreen you can type the name of the person you want to send an SMS to. Press the menu key, and you'll have the option to email/SMS/MMS the person.
I read some comments at berrycoder.com that QSMS doesn't work on the 8900. Maybe it has something to do with the "Q" key already being assigned to "Vibrate"?
i long ago bookmarked this page: blackberryfaq.com/index.php/Tips_and_Tricks it has lots of good tips. although there is no shortcut by bb of its own but still u can go to sms messages by alt+s
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