Sorting by kind with folders at the top can be done in Leopard with a little hacking:
OBLIGATORY WARNING:
If you're not comfortable with this, don't do it!
With that out of the way:
- navigate to:
/System/Library/CoreServices/
- right-click
Finder.app and select
Show package contents...
- navigate to:
Contents>Resources>English.lproj
- backup
InfoPlist.strings
- open the original
InfoPlist.strings in a text editor
- locate the line that says:
- add a space at the start of the second
"Folder":
- save the file
- reboot or relaunch Finder
The space in front of "Folder" forces folders to the top of the list when sorting alphabetically by kind.