D&D Downloads worth burning to CD

[Orius]

Not to hijack the thread, but though Map of the Week is no longer updated it is still available: http://www.wizards.com/default.asp?x=dnd/mwa/archive2004

Yeah, they're still there, but you got to go digging for them.

 

[Quickleaf]

I'd recommend Hot Pursuits, a pdf product available at rpgnow that's all about chases. It's definitely worth buying!
I also was impressed by Corsairs for it's comprehensive treatment of ships, ocean navigation and ship combat.

Some others that are free...

Woodelf's alternate weapon proficiency rules (free pdf in House Rules)
Ars Magica free 4th edition (not d20, but great material)
My article on variant Wizards in the "Elemental" charity project on rpgnow
SNAP d20 rules for simultaneous initiative
"Legends" a d20 system by Tim Condon (it has really good treatment of skills!)
Magical Medieval City Guide (free from Expeditious Retreat) from rpgnow
Lineage Sorcerer by Ron Owen