[sdiy] PCB Layout terminology

[Mountain Man]

I'm continuing my quest for a usable and inexpensive PCB layout and
schematics program.  I've downloaded about a dozen demos and shareware
programs from the net.  Some of them look like they might be quite usable,
but I'm getting hung up on not knowing the lingo.  I'm no longer scared off
by part numbers like "2N3904" (I seem to be getting quite friendly with these
guys in fact), but suddenly I'm now confronted with designations like TO-92
(I *think* that goes with the 3904!).  I can't figure out how to go from the
parts list/schematic to these layout designations.  Are there "translators"
available?  A good website, perhaps?

If I do find software packages that look good, I'll be sure to report here.
So far, nothing has popped out as the obvious candidate.

Thanks for your help,
Elby