Skype has just released Skype 5.3 for Windows. The release mainly improves Skype's call quality and fixes a number of bugs.

In addition to these quality-related efforts we have also introduced some feature improvements:

- Improved quality of video received from Skype on mobile devices
- Skype shows users' presence icons on collapsed contact profile cards
- Conversation topic editing button is now always available on the conversation header
- If a phone number is added to a profile after a failed call attempt, Skype starts a call automatically
- Automatically switch to SMS entry after user adds mobile phone number to profile after failing to send SMS due to lack of phone number

Further details about the tweaks introduced on this version (5.3.0.108) are available here