I went around the net today looking for AVG 2011 changes.  Their site is all about selling product and pretty thin on actual info.  I had to go to their forums to get the list of AVG 2011 upgrades.  Anyway, here they are:

API: Updated system tray scan icon context menu.
Anti-Rootkit: Improvements in anti-rootkit detection.
AvgSys: Temporary log files are deleted after restart.
Core: Detection of the next modification of Virut has been added.
Core: Detection of Swizzor, modification 2009-11-18.
Core: Swizzor detection is now much more generic.
Core: Polymorphic malware detection methods have been improved and speeded up.
Core: Speed improvement in static heuristics.
Core: Thorough (more CPU consuming) scanning mode for elder viruses and obsolete exploits.
Core: More flexible in algoritmic detection.
Core: More reliable ETAP detection.
Core: More stable on incomplete and non-standard files.
Core: Virut definitions simplified.
Core: Support for IMAP protocol added in Online Shield.
Core: Added possibility to pause caching.
E-mail Scanner: Logging support was added to The Bat plugins.
E-mail Scanner: Adding spam information into e-mail headers in MS Outlook plug-in.
E-mail Scanner: Added AntiSpam statistics.
E-mail Scanner: Added support for IMAP protocol.
General: Greatly improved overall performance.
General: Introducing a new PC Analyzer component providing information on the computer status.
General: Introducing new Product Improvement Programme targeted on overall Internet security level increase.
General: Scanning engine updates do not depend on program updates.
General: Added scanning for attempts to enter infection into system registry keys.
Kernel: Scanning archive files for the Whole computer scan, Scheduled scan and Removable device scan was by default disabled.
Kernel: Scheduled scans run in new sensitive mode by default.
Kernel: Anti-Rootkit component is now available for free products.
Kernel: IDP is now available for all AVG clients.
Kernel: Created new library to replace AVG API in e-mail clients.
Kernel: Added IMAP protocol support.
Kernel: Added new /log parameter.
Language: Added localization into European Spanish language.
Outlook: New MS Outlook plug-in implemented.
Outlook: MS Outlook plug-in is now able to report misclassified spam.
Outlook: RTF certification works in all Outlook versions.
Resident Shield: Fixed problem with occasional blocked deletion of files.
Resident Shield: Fixed issue with specification of files to be excluded from RS scanning.
Safe-Search: Improved accuracy of Safe Search verdicts.
Safe-Search: Added support for bing.net and bing.search.daum.net.
Safe-Surf: Scanning performance improvements.
Safe-Surf: Add link checking support when sending messages in Facebook and MySpace.
Scheduler: By default, the Whole computer scan is now disabled.
Setup: New structure and visual style was implemented for the installation process.
Setup: MSI setup has been implemented.
Setup: Increased compatibility with Citrix systems.
Setup: Log file path can now be set via LoggerPath command line parameter.
Setup: OS restart is forced even when the workstation is locked (silent mode).
Setup: AVG 8/AVG 9 will be uninstalled before AVG 10 installation.
Toolbar: New version of Toolbar implemented.
Update: MSI technology implemented to apply program updates.
Update: Update files are internally signed by AVG certificate.
Update: Added support of IPv6.
User Interface: Introducing a new graphic style of AVG brand logo.
User Interface: AVG 2011 comes with a new modern and easy to navigate visual style, and rearrangements in UI structure of several dialogs.
User Interface: Added option to start computer scan from main UI.
User Interface: Implemented new AVG Windows sidebar gadget.
User Interface: Added possibility of immediate repair of any component error status using Fix all button accessible from the main UI.
User Interface: Added possibility to scan whole computer after installation.
User Interface: Add sound notification for update start/stop.