Leaflet Changelog

0.3 (master)

Added WMS support (TileLayer.WMS layer).
Added different projections support, having EPSG:3857, EPSG:4326 and EPSG:3395 out of the box (through crs option in Map). Thanks to @Miroff & @Komzpa for great advice and explanation regarding this.
Added GeoJSON layer support.

Improved panning performance in Chrome and FF considerably with the help of requestAnimationFrame. #130
Improved click responsiveness in mobile WebKit (now it happens without delay). #26
Added tap tolerance (so click happens even if you moved your finger slighly when tapping).
Improved geolocation error handling: better error messages, explicit timeout, set world view on locateAndSetView failure. #61

Added MultiPolyline and MultiPolygon layers. #77
Added LayerGroup and FeatureGroup layers for grouping other layers.
Added TileLayer.Canvas for easy creation of canvas-based tile layers.
Changed Circle to be zoom-dependent (with radius in meters); circle of a permanent size is now called CircleMarker.
Added mouseover and mouseout events to map, markers and paths; added map mousemove event.
Added setLatLngs, spliceLatLngs, addLatLng, getLatLngs methods to polylines and polygons.
Added setLatLng and setRadius methods to Circle and CircleMarker.
Improved LatLngBounds contains method to accept LatLng in addition to LatLngBounds, the same for Bounds contains and Point
Improved LatLngBounds & Bounds to allow their instantiation without arguments (by @snc).
Added TMS tile numbering support through TileLayer scheme: 'tms' option (by @tmcw).
Added TileLayer noWrap option to disable wrapping x tile coordinate (by @jasondavies).
Added opacity option and setOpacity method to TileLayer.
Added setLatLng and setIcon methods to Marker.
Added title option to Marker.
Added maxZoom argument to map.locateAndSetView method.
Added ability to pass Geolocation options to map locate and locateAndSetView methods (by @JasonSanford).
Improved Popup to accept HTML elements in addition to strings as its content.

Added Makefile for building leaflet.js on non-Windows machines (by @tmcw).
Improved debug/leaflet-include.js script to allow using it outside of debug folder (by @antonj).
Improved L definition to be compatible with CommonJS. #122

Fixed a bug where zooming is broken if the map contains a polygon and you zoom to an area where it's not visible. #47
Fixed a bug where closed polylines would not appear on the map.
Fixed a bug where marker that was added, removed and then added again would not appear on the map. #66
Fixed a bug where tile layer that was added, removed and then added again would not appear on the map.
Fixed a bug where some tiles would not load when panning across the date line. #97
Fixed a bug where map div with position: absolute is reset to relative. #100
Fixed a bug that caused an error when trying to add a marker without shadow in its icon.
Fixed a bug where popup content would not update on setContent call. #94
Fixed a bug where double click zoom wouldn't work if popup is opened on map click
Fixed a bug with click propagation on popup close button. #99
Fixed inability to remove ImageOverlay layer.

Fixed a bug where paths would not appear in IE8.
Fixed a bug where there were occasional slowdowns before zoom animation in WebKit. #123
Fixed incorrect zoom animation & popup styling in Opera 11.11.
Fixed popup fade animation in Firefox and Opera.
Fixed a bug where map isn't displayed in Firefox when there's an img { max-width: 100% } rule.

Fixed a bug that prevented panning on some Android 2.1 (and possibly older) devices. #84
Disabled zoom animation on Android by default because it's buggy on some devices (will be enabled back when it's stable enough). #32
Fixed a bug where map would occasionally break while multi-touch-zooming on iOS. #32
Fixed a bug that prevented panning/clicking on Android 3 tablets. #121
Fixed a bug that prevented panning/clicking on Opera Mobile. #138
Fixed potentional memory leak on WebKit when removing tiles, thanks to @Scalar4eg. #107