I exchanged my Canon D30 to 20D at 2005-03-15. The change was done because of following reasons: better autofocus, better ergonomics and better high ISO performance. Below is my little comparison between D30 and 20D based on actual usage not reading other reviews.

20D pros:

• Autofocus is much faster and more accurate.
• Ergonomics are much better, for example focus point selecting joystick is very good.
• Build quality is better, camera feels much better on hand.
• High ISO performance is much better.
• 8Mpix is more than 3Mpix, but at my use when only publishing photos to internet and printing always A4 size, this isn't very big benefit. Naturally slight cropping can be done and still print at A4.
• Better battery life using same BP-511 batteries.

20D cons:

• File size is much larger, before my 1GB MicroDrive was enough for half day travelling in nature but now it's full in couple hours.
• Setting ISO value is much more difficult than in D30 [in D30 you can set the button inside back command dial to activate ISO adjustment, in 20D you have to press one of the buttons in front of the top LCD-screen and I haven't yet learned (= I will not learn never) to find that button without moving my eye from viewfinder]

Digital Darkroom links (Link to parent category)

General

Software

Dave Coffin's RAW converter
Phase One - DSLR One
Breeze Systems (BreezeBrowser, Downloader...)
Digital Workflow - Converters link page
Pekka Saarinen's Linear Sharpen photoshop action
DCRAW - converted to Mac
DCRAW tutorial by Guillermo Luijk

Technique

Panoramas

Panorama Tools

Panorama Tools (Mirror)
Panorama Tools
Panorama Tools (Mirror)
PTGui
ePaperpress insructions for Panorama Tools
ePaperpress insructions for Panorama Tools
Caldwell photographic - Correction distorsion and color fringing
Correction distorsion and color fringing
Caldwell photographic
Max Lyons - PTAssembler tutorial
Big Ben's Panorama tutorial
John Houghton PTGui tutorial
panoguide.com

Taking panorama pictures

DIY Pan/Tilt-head
Home Built Panorama Head
Jasper-Engineering: Pano head
Big Ben's panorama tutorial
10D tutorial (8mm Sigma lens)
Kaidan - Kiwi-VL panorama head
Panoguide - Setting up to shoot panorama

Canon D30 and 15mm fisheye
Photo.net - Fisheye to rectlinear conversion
Luminous Landscape - Imagealign

AIM-DTP
Sharpening

Outback photo - Edge Sharpening
Luminous Landscape - High pass sharpenign

Exposure / Dynamic range

Luminous Landscape - Blended exposures
Luminous Landscape - Digital split neutral density filter
Luminous Landscape - Local Contrast Enchancement
Luminous Landscape - Hybrid conversion
AIM: The Linear RAW Workflow

Color

Luminous Landscape - Making better Black & White photos

Luminous Landscape - Instant PhotoShop
AIM-DTP - Color Dither Gamma (how to adjust gamma for monitor)
High Dynamic Range (HDR)

Naturescape's HDR tutorial

Apple

Forums

Mac Forums
Hopeinen Omena (in Finnish)

Aperture

AUPN Aperture Users Professional Network