I recently setup my blogger account so that I could post blogs from my blackberry anytime I wanted. You will require the ability of sending emails from your BB in order to do this.
Go to your Blogger profile. Go to Settings --> Email
For "Mail-to-Blogger Address", the format of
username.blank@blogger.com will be given.
Fill the blank with a secret word or else anyone with that word will be able to post on your blogger account.
You have two options after. You can choose to publish the posts directly to your blog or have them saved as a draft so you can edit them before posting. Select whichever one you want and click on save settings.
Now just send an email from your BB to the email address and VOILA!
Helpful tip - If you choose the option of posting directly to your blog but would like to eliminate the signature that is sent with your blackberry emails, e.g. "Sent from my Blackberry device", after your email just type in "#end" and it will not appear.