For those experimenting with Apple's new browser, here is an add-on that enables a debug menu.
It allows one to see the DOM tree, Render tree, and View tree, change the UA string (which looks like it can change automatically??) by selecting from "Debug" menu.
Boris Mann
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And for those that don't feel like downloading a whole program, it's as simple as typing one command into the terminal:
defaults write com.apple.Safari IncludeDebugMenu 1
Of course, you'll want to do this while Safari /isn't/ running.
Jim Puls
The Mac OS X Open Source Tools Collection
Here's a good ruler for measuring directly from a Macintosh screen. It has several units of measure, and can be set up to measure horizontal or vertical dimensions.
http://www.artissoftware.com/screenruler.html
Jim Rura
<tip author="Boris Mann" type="OS X Tips">
The NetInfo database stores lots of stuff that people from other *NIX backgrounds expect to find in system text files. The HOSTS file, passwords, and users are probably the most obvious. The NetInfo Manager is actually fairly easy to use, once you start experimenting with it.
</tip>
...give Macsftp a try (there's a 15 day demo available). Some linux hosts are switching over from ftp to the secure version and this causes fetch problems, typically appearing to login OK, but then spending forever seemingly doing nothing until an error is returned.
Cheers
Rob
<tip type="switching between apps in OS X">
option-command click on an app in the Dock to switch to that app, show all it's windows and hide all other windows.
</tip>
<tip type="customize your dock">
Transparent Dock allows you to modify the Dock in more ways than adjusting it's transparency: http://homepage.mac.com/kfkel/
</tip>
<tip type="BBEdit HTML editing shortcuts" author="Michael Barrett">
Need to edit an IMG (or another) tag in BBEdit?
With your cursor *within* the brackets of the start tag you wish to edit, use the keyboard shortcut command+option+M to bring up a dialogue box of properties for that element. Refresh an image size, update a link, etc.
Command+M within the body of an HTML document will bring up a list of elements to be inserted. The tag is inserted at the cursor. The shortcut is "smart" and will only list elements that are appropriate to where you have the cursor placed. So if your cursor is in the document HEAD, you will get a list of meta tags, styles, and head-appropriate elements.
</tip>
<tip author="Shoshannah Forbes">
Some software sites for Mac that I like:
http://www.versiontracker.com/macosx/index.shtml
http://www.macosarchives.com/
http://www.macupdate.com/
http://www.macosxapps.com/
http://osx.hyperjeff.net/
http://fink.sourceforge.net/
http://openosx.com/
http://directory.google.com/Top/Computers/Software/Shareware/Macintosh/?tc=1
</tip>