2.0
http://wiki.audacityteam.org/wiki/Release_Notes_2.0.0
Bug fixes
Interface

    Fixed playback speed and synchronization problems when dragging clips or tracks between tracks having different sample rates.
    (Windows) Removed a crash risk where shortcuts could be used to record or import in one project while importing or exporting in another. 

Imports and Exports

    Fixed crashes when changing the sample format of read-directly WAV or AIFF files using the Track Drop-Down Menu.
    Fixed a crash importing MP3 files that had duplicate metadata tags (this is a bug in current libsndfile which has been patched in Audacity; MP3 files mislabeled as WAV which have duplicate tags will still crash Audacity on Linux if Audacity has been compiled against an affected version of system libsndfile).
    Fixed an issue where excessively high or corrupted sample values in the audio could corrupt exports from the start of the problem for the rest of the file, and could corrupt the rest of the project.
    (Linux) Fixed Audacity could not be compiled against FFmpeg 0.7.x and 0.8.x. 

Effects and Analysis

    Fixed crash on launch when using "Ambisonic Decoders (PC)" VST plug-ins and other plug-ins that enable additional floating point exceptions.
    Fixed Plot Spectrum background could be transparent on some machines.
    Bug fixes for Click Track, High Pass, Low Pass and Vocal Remover.
    Chirp, Tone and Silence generators now remember their settings. 

Other miscellaneous bug fixes
Changes and Improvements

    New Interface preference to show the track name in the display (this is off by default).
    Longer default Playback preference for effects preview and preview before cut.
    Restored use of Page Up and Page Down to scroll horizontally. 


1.3.14 beta
• Bug fixes for:

* Interface:
- Cutting or copying from a track at a given sample rate into a track at another rate resulted in speed-changed audio.
- Generating inside a clip could modify the clip length or create spurious clips.
- Recorded stereo tracks were only half the height of imported or generated stereo tracks. Imported stereo files had a "1" appended to the track name.
- Edit > Region Save did not save the cursor position.
- (Windows) Projects crashed when clicking rapidly inside the interface or when applying repeated effects towards the end of audio tracks.
- (Windows) Some Unicode characters could not be typed into labels, or caused a freeze using some input methods.
- Numerous other interface fixes including Dependencies dialog, Keyboard Preferences and spurious lines drawn on waveform.
* Imports and Exports:
- (Windows, OS X) Audacity's optional FFmpeg and LAME libraries were not detected when other versions of those libraries existed on the system.
- Imported ID3v2 metadata tags were removed when exporting without the Metadata Editor appearing (for example, when using an export command in Chains). Note: As a result of this fix, ID3v1 tags must now be written by exporting using (external program) and an installed LAME.
* Other bug fixes:
- Nyquist effects: fixes for crashes, incorrect slider behaviour and better support for backslashes, double quotes and Unicode characters.
- (Windows and OS X) Processing of VST effects was substantially slower than in previous versions of Audacity.

• Changes and Improvements:

* Control Toolbar renamed to Transport Toolbar.
* Device Toolbar (on by default) now contains all input and output device choices, including host and recording channels. Input/output choices are longer in Mixer Toolbar on Windows XP or some older operating systems. New Transport > Rescan Audio Devices menu item to refresh the device list.
* New "Sync-Lock Tracks" feature (turned on in the Tracks menu) to allow groups of audio and/or label tracks to retain synchronisation when the track length changes.
* Equalization: New "Manage Curves" dialog for importing and exporting curves.
* Noise Removal: New "Sensitivity" slider and "Isolate Noise" choice.
* New "Extended Import" Preferences for specifying different importers to open specific file extensions.
* Improved Automatic Crash Recovery with all project changes autosaved.
* Improved error reporting when read-directly imported files are missing.
* MIDI tracks can be vertically zoomed, time shifted and display bar lines.
* On Windows and Linux, the window Close button and other system close or shutdown commands now quit on closing the last window. File > Close now always clears to a new, empty project.