Over the past 24 hours, several notable iPad apps were updated to include support for the new iPad’s retina display. PDF Expert, my favorite PDF reader/annotator on the iPad, also received a great new feature – Document Thumbnails. Now all files are shown as thumbnails and moving PDFs around (i.e into folders) can be done via simple drag ‘n drops. Another anticipated update came from Air Display, where turning on the “HiDPI mode” on your Mac OS Lion will essentially turn that new iPad into a gorgeous 2048 x 1536 secondary display for your iMac/Macbook. Check out the complete “what’s new” for these updated apps after the break.

Facebook

What’s New in Version 4.1.1

In this release, we added some features and fixed some bugs so now:
- You can go offline in chat
- The right profile picture appears for everyone
- Your list of friends always includes all your friends
- In sets of photos, your name is displayed correctly
- Photos of people who like Facebook Pages load correctly
- Your friend-request notification only lights up if you have a request
- You can change your language to Czech, Danish, Greek, Indonesian, Malaysian, Norwegian (Bokmal), Portuguese (Portugal) or Thai
- If you’ve got a new Retina iPad, you’ll see a crisp, high resolution interface

 Facebook, Facebook, – Free

PDF Expert

What’s New in Version 4.0

- PDF Expert now supports retina display on the new iPad
- PDF Portfolios and PDF videos enrich the use of PDFs on your iPad
- Document Thumbnails are added to help you browsing your files

 Readdle, PDF Expert – Fill forms, annotate PDFs, – $9.99

Air Display

What’s New in Version 1.6

HiDPI
• If you have Mac OS X Lion and a Retina iOS device, now you can turn on “HiDPI mode.” HiDPI is a built-in Mac OS X feature that makes UI elements render at double resolution. It’s absolutely stunning on a Retina display. By default, Mac OS X disables HiDPI because until now, there has been no Mac display with high enough resolution. Air Display on a new iPad, with its 2048×1536 264-dpi Retina display, finally brings HiDPI to life.

RETINA DISPLAY (Mac OS X 10.6+ only)
• Devices with Retina displays now can optionally render at high resolution. You can still choose to view at non-Retina resolutions.
• Air Display now uses the full screen resolution when scaling (while doing video out or mirroring a larger device).

BUG FIXES
• No longer disabling drivers on MacBook Pro models with NVIDIA 9400M/9600M video adapter. Please see avatron.com/lion for more information.
• Fixed bugs related to modifier keys on the virtual and Bluetooth keyboards, when connected to a Mac. Requires Mac Air Display Connect update.
• Fixed the “Enable Keyboard” option (in the Air Display section in the Settings app).
• Improved frame rate and quality.
• Fixed video output bugs.

 Avatron Software, Air Display (TMA Review), – $9.99

NOOK by Barnes & Noble

What’s New in Version 3.1.3

• Updated and enhanced for iPad’s new Retina display – words and images load sharper
• Easier-to-use Highlight feature for NOOK Books – highlight all the words you want
• On NOOK for iPad only: Now read in 1 or 2 columns when using landscape orientation
• Several bug fixes

This update requires iOS 4.3+ and works on the new iPad, iPad2, iPad1, iPhone 4S/4/3GS and iPod touch (3rd generation and above).

 Barnes & Noble, NOOK by Barnes & Noble, – Free

UPAD

What’s New in Version 1.96

- Retina display support for new iPAD
- Fixed data storing bug
- Fixed GoogleDocs upload bug
- Fixed minor bugs

 PockeySoft, UPAD, – $4.99