hey Inky...erm, could I salvage some of your tones as well? hehe....I really know little about other PS functions. I've heard of clone and pattern tools but haven't used them. All I do with mine is "layer, multiple, darken and paint!" 0.o No wonder it takes so long for me to complete my works!
Alright, for fonts, I use Blambot sometimes and
http://desktoppub.about.com/cs/fonts/
Conversation bubbles are mostly Blambot or I just do an elliptical marquee and just "stroke" it in black.
For tones, I've salvaged free tones from the Internet, make some by borrowing patterns from manga scanlations or just make my own. It may also help to download brush patterns. I'll share my tones in Inky's screentone thread once I've collected them together in one folder in my computer.
EDIT: Aww man, I've just discovered how to use the pattern tool!!
Silly me!