many, see:
http://www.montebellosoftware.com/downloads/Ascent_Version_Log.rtf

• New feature: selecting a lap in the browser now highlights the lap's section in the mini-profile view (of the browser)
• New feature:"Save selected...(activity)" (in file menu)
• New feature: "Email selected...(activity)" (in file menu, requires OSX Mail.app to be configured)
• New feature: contextual menus in main browser, activity detail, and map detail views (invoked by right mouse button on multi-button mouse, control-click on 1-button mouse)
• New feature: "center map at click point" available in contextual menu of detailed map view
• New feature: store most view settings persistently: browser view, activity detail view, map views
• Improvements to the map detail view, so that zoom and other controls work like standard map applications
• Improved "Notes" entry in the main browser, using a dedicated editing panel that supports spell checking, undo, etc.
• Added hot keys in map detail view, such as "I" for zoom in, "O" for zoom out
• Mouse scroll wheel in the map detail view now performs zooming
• .tcx/.hst import now imports "Notes" into activitites
• Made distance and time "ticks marks" on the vertical axis of the activity detail view use more user-friendly intervals
• Made "speed" in activity detail HUD show a single digit after the decimal point
• Performance improvements in the activity detail (required removal of the "dotted" and "dashed" line options
• Lines in the activity view can now be 1, 2, or 3 pixels in width
• Other misc bug fixes

• New feature: selecting a lap in the browser now highlights the lap's section in the mini-profile view (of the browser)
• New feature:"Save selected...(activity)" (in file menu)
• New feature: "Email selected...(activity)" (in file menu, requires OSX Mail.app to be configured)
• New feature: contextual menus in main browser, activity detail, and map detail views (invoked by right mouse button on multi-button mouse, control-click on 1-button mouse)
• New feature: "center map at click point" available in contextual menu of detailed map view
• New feature: store most view settings persistently: browser view, activity detail view, map views
• Improvements to the map detail view, so that zoom and other controls work like standard map applications
• Improved "Notes" entry in the main browser, using a dedicated editing panel that supports spell checking, undo, etc.
• Added hot keys in map detail view, such as "I" for zoom in, "O" for zoom out
• Mouse scroll wheel in the map detail view now performs zooming
• .tcx/.hst import now imports "Notes" into activitites
• Made distance and time "ticks marks" on the vertical axis of the activity detail view use more user-friendly intervals
• Made "speed" in activity detail HUD show a single digit after the decimal point
• Performance improvements in the activity detail (required removal of the "dotted" and "dashed" line options
• Lines in the activity view can now be 1, 2, or 3 pixels in width
• Other misc bug fixes