I'd be interested in links for Encore resources myself. Always handy to have.

However, if you have found some downloadable menus then you already have more buttons don't you? Just open those new menus up in Photoshop, remove all the other layers other than a single button and 'save as' - instant new button.

As for creating buttons that you can drag and drop a timeline to to get a frame of your movie inside the button. Read the documentation. It's just a case of getting yor layer naming convention correct. i.e. a layer with a specific suffix (can't rememebr what it i though offhand) will be replaced by frame picture when a timeline is dragged onto it. Simple as that.

Maybe you could include links to the downloadable menus you have already found - for the rest of us.

__________________
I'm not young enough to know everything!