About 600 per month. More than before my BB actually, cos its easier (qwerty) and an unlimited plan. Also none of my friends has a BB for BBM or regularly check their mails.
Posted from my CrackBerry at wapforums.crackberry.com
When I got my first texting phone, I usually had around 4-7000 texts a month. Just got my BB a few weeks ago but my texting habit has slowed down. I'd say I put in around 2500-4000 texts a month now.
I went from about 4000 a month to about 40 a month... I loved texting, my phone never left my hand but after i got a blackberry everyone i knew i told about them and now they all have blackberries... There are still a few that arent enough of a "text a holic" to switch to bb so they keep their dinosaurs...