Homebrew PCBs

Hi all,

After a hiatus of many years I'm getting back into electronics (robotics 
in particular). I have made a couple of PCBs using the photo transfer 
method.
I am now venturing into SMD components and want to use the toner 
transfer method as I have discarded my UV lightbox.
So I'd like to know what methods you guys use to get very thin traces 
reliably.
What are the limits of this method?
What are the things to look out for to get reliable thin traces?

Thanks.

Bert