New OED for Mac OS 10.4 and above
I have been told by the OUP [Oxford University Press] that a new Mac version of the OED [Oxford English Dictionary] will finally be released in April 2009 As far as I know it will not work on 10.3.9 and below:
"I'm pleased to be able to tell you that we have a new version of the OED CD-ROM - 2nd Edition Version 4.0 - in development at the moment, due for publication in April 2009. This version will have brand new software and a new design of user interface, a new word-wheel which supports incremental letter-by-letter browsing, an additional 5,000 news words and meanings, and will be Windows and Mac compatible.
"Information is available on our website at: <http://www.oup.com/uk/catalogue/?ci=9780199563838>.
"Registered Users of the Version 1.0d Mac software such as yourself will be entitled to purchase this software for £127.17 plus VAT and £3.00 postage. This price includes a 25% discount off the standard price of £169.57 plus VAT and postage. "
No idea about the upgrade path in the U.S. and elsewhere.