Version 1.0.0 Io
Please read this entire document for important information about this release.

Whats new in Version 1.0.0?

This release includes over 265 bug fixes and enchancements over the QGIS 0.11.0 release. In addition we have added the following new features:

HIG Compliance improvements for Windows / Mac OS X / KDE / Gnome
Saving a vector layer or subset of that layer to disk with a different Coordinate Reference System to the original.
Advanced topological editing of vector data.
Single click selection of vector features.
Many improvements to raster rendering and support for building pyramids external to the raster file.
Overhaul of the map composer for much improved printing support.
A new 'coordinate capture' plugin was added that lets you click on the map and then cut & paste the coordinates to and from the clipboard
A new plugin for converting between OGR supported formats was added.
A new plugin for converting from DXF files to shapefiles was added.
A new plugin was added for interpolating point features into ASCII grid layers.
The python plugin manager was completely overhauled, the new version having many improvements, including checking that the version of QGIS running will support a plugin that is being installed.
Plugin toolbar positions are now correctly saved when the application is closed.
In the WMS client, WMS standards support has been improved.
Complete API revision - we now have a stable API following well defined naming conventions.
Ported all GDAL/OGR and GEOS usage to use C APIs only.

Special Requirements Qt 4.3.0 is required. The Expat XML Parser is required for the GPS plugin. This vastly improves the speed and memory management when loading GPX files. The raster georeferencer plugin requires the GNU Scientfic Library (GSL). GSL and Expat are optional and required only if you want to use the georeferencer or GPS plugins respectively. SQLite is always required.

Known Issues in this Release

General

Some internationalization (translation) files may be incomplete.
QGIS is not bug free - we make no assertions as to its fitness for use for any particular purpose. Use entirely at your own risk.

OS X Specific

Due to a limitation in the Quicktime graphics engine, there is a limit on the number points allowed per feature. See the Readme that comes with the OS X dmg

Windows

Reporting Bugs

If think you have found a bug, please consider reporting it to the development team. The steps to report a bug are:

Go to the Bug Tracker at https://svn.qgis.org/trac
Read Using Trac With QGIS to learn about the submission process
Review the list of current issues to make sure your bug has not already been submitted. If it has, review the submission and see if there is anything you can add to the bug report to aid the developers
If your bug has not been reported, create a new ticket, making sure to either login to trac or provide your email address. Tickets lacking contact information are subject to deletion.

Installation Guide: How to build and install QGIS. The guide is available as part of the User Guide.

User Guide: The definitive guide to using QGIS (be sure to read this!). The User Guide is available in pdf format.