Here are some of the features:
Cleaner, faster, less cluttered dashboard
Multi-file upload with progress bar
Bonus: EXIF extraction (great for Photographers/Photo Bloggers)
Search posts and pages
Password strength meter
Concurrent editing protection
Few-click plugin upgrades
I could actually go on and post about all the features but that would be like re-inventing the wheel as Matt Mullenweg has already posted an epic about WordPress 2.5.
Here’s a screencast of 2.5′s ne feature – The Gallery
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