Connectivity
Software
The 30D is packaged with the EOS Digital Solution Disk Version 12, a full suite of applications for asset management, editing and connectivity, including using Canon's separate wireless transmitter for the 30D. Look for our evaluation of the software in our full review.
Jacks, Ports, Plugs
The 30D has a USB 2.0 jack, analog video out, a DC power input jack, a standard PC flash sync terminal, and a hot shoe for dedicated or conventional flash.
Direct Print Options
Canon says the 30D has new and powerful direct printing features beyond its PictBridge and 
DPOF compatibility. Listed features include adjustment for paper sizes up to 13 x 19 inches, face brightening and other image parameter settings. Look for our full review for an evaluation.
Battery
Canon says the 30D will last longer on a charged battery than the 20D, even with its larger and more power-hungery LCD, because the 30D incorporates microprocessor-controlled power management. The 30D is compatible with several Canon Lithium-ion rechargeable packs. The listed ones are: BP-511A/514/511/512. We're glad to see backward compatibility, and Canon users who add the 30D to a system that includes older cameras will benefit from this interchangeable system.
Memory
The 30D accepts CompactFlash cards, the most common memory format for DSLRs. CompactFlash is a reliable, relatively cheap and robust memory format.
Other Features
Image Storage - The 30D stores up to 9,999 images in a folder, up from 100 on the 20D, simplifying manual file transfer and improving organization on longer shoots.
Battery Power Display - Battery power is displayed in 4 steps, which is better than the 20D's 3-step display. It should give users a better idea of how much battery life remains.
Auto Noise Reduction - The 30D offers auto noise reduction for long exposures, and does not double the exposure time to accomplish it.
Flash Exposure Lock Set - When flash exposure lock is set, an icon shows up in viewfinder.
