Currently re-watching the DBZ timeline since I haven't seen it in years. I'm upto episode 137 (Last Ditch Effort). I was just wondering where all the DBZ movies fit into the continuity. Already watched 'Dead Zone', although this was halfway through watching the Frieza saga as I didnt even no these films existed. Since 'Dead Zone' is set in the Garlic saga, I was kinda thrown off.

Call me a geek if you like. But then again, aren't we all geeks, lol?

We are ALL undeniably geeks, indeed.
I think, as with almost all anime movies that branch off from some series, that these movies are only really canon by the fact that they are the characters, settings, etc. That's usually the basis of an OVA movie, a stand-alone adventure.
DBZ = Good times d(^_^)b

they do fit in, in between the different sagas. though it's hard to place them... it is possible.. Just have to watch the show and the movies and try and TRY to fallow along with it...