I'm currently using LexSpell with my BES work email account and love it. But I can't seem to get it to work with my Yahoo Mail that I also have linked to my Blackberry. Is this a possibility?

Not with the current release, I am afraid.

We should very soon post for beta testers on the next release that focuses particularily on adding this feature which, to our own surprise, appeared to be not trivial to implement.

You can run ahead and contact our support with request to beta-test...but please be prepared for back-and-forth type of experience...as I said it seems harder than it sounds.

Bobby - glad to see that you are working on a version that will cover all accounts on a users blackberry