I recently updated my Mac Book Pro to Mac OS X 10.5 Leopard. The upgrade process was pretty seamless and I only had a few initial performance issues that seemed to go away with time.
I did notice one missing feature this morning while doing some audio troubleshooting on a just eBay purchased Telos-One with Paul Figgiani and Victor Cajiao that the Leopard's Finder no longer allows you to preview MP2 files in the Columns view or in the new Quick Look feature.
This feature was in Mac OS X 10.4, and I am perplexed on why it would go away.
For podcasters and other audio engineering folks MP2 are used a great deal in collaborative post production.
If anyone knows a work around or a way to enable the lost feature, please let me know.