Mac OS X Leopard build 9A241

Mac OS X Leopard build 9A241 is the first developer beta build of Mac OS X Leopard, which was distributed to developers on 7 August 2006 after being demoed during WWDC '06. This build requires a Mac with a PowerPC G3, G4,G5, or Intel processor to work.

Time Machine
Time Machine, an automated backup utility, has been added.

Spaces
Spaces has been added for creating multiple desktops.

Finder

 * Grid spacing can now be adjusted in Finder.
 * Trash now includes an "Empty" button.

Spotlight

 * Spotlight can now be opened in its own dedicated window.
 * An early version of Quick Look has been added to Spotlight.

Safari

 * Web Clips for Safari 3 has been added.
 * Bookmarks can now be viewed in its own separate page.
 * "Find" has been added for searching words on a web page.

iChat

 * iChat has been updated to no longer use the brushed metal design.
 * An option to automatically save chat transcripts has been added.
 * Multiple chats can now viewed in the same window.
 * Address Book is no longer required for adding buddies.

Application support

 * 64-bit applications are now supported.
 * Support for Classic applications has been removed.

Miscellaneous

 * Menu bar items can now be searched from the "Help" menu.
 * Similar to iChat, the brushed metal design has been removed from Automator and DVD Player.
 * Support for multiple accounts has been added to iCal.
 * Mail now supports RSS Feeds, Stationery, Notes, and to-dos.
 * GIF captures can now be taken in Photo Booth.
 * Text-to-speech has been updated to be more natural.

Bugs and quirks

 * Audio doesn't work when headphones are plugged in.
 * The icons for external volumes are placed incorrectly.
 * Safari doesn’t work out of the box on G3s, but one can manually install Safari 3.1.1 from the Safari Tiger update and it functions as normal.