A blackberry client is being developed for MyLifeOrganized. I don't have anything to do with the company and I'm not currently using the software although I have in the past. MyLifeOrganized for BlackBerry | Google Groups
Not sure how useful the small screen will be with this program, but I thought it was good when I was using a Windows Mobile phone.
My opinion, this really isn't a typical day-to-day todo list type of program and was geared more towards project tasks. I'll probably give it a try when it is available.