When you think of push-to-talk you might conjure up images of construction workers on job sites wielding yellow ruggedized handsets. However, recently Verizon rolled out push-to-talk to its business-centric BlackBerry Tour handset in an attempt to bring PTT to new industries and work places. The adoption rate for this $5 monthly service has apparently a bit sluggish amongst Tour owners, as Verizon is reportedly launching a new promotion that will allow 9630 owners to add the PTT service to their line…for free. The free price tag is not a short-term gimmick either, as the $0/month figure is valid for the lifetime of your handset (*cough* trackball *cough*). Interested Tour owners can download the PTT software and activate the service prior to the promotion end-date of June 30th. The leaked slide did not indicate whether this promotion extends to current customers who already pay for the service, or if it will be extended to other BlackBerry handsets. We’ve sent some feelers out and will let you know what we dig up.