WinAVR comes with Programmers Notepad UI by default. It is very powerful editor, but if you want more robust UI with better project management abilities you can try Java based Eclipse IDE. It is universal open source IDE which supports almost any compiler by using plugins. Eclipse has some nice features that makes it attractive, like Subversion integration, code completion in editor.
Thomas Holland has been working on AVR plugin for Eclipse which allows to use Eclipse features with AVR-GCC compiler. The newest release has nice set of features and updates like: automatic makefile generation, MCU type and clock frequency can be selected during project creation, project can be compiled for debug only or as complete release with flashable hex files, tool-chain has integrated assembler, nice viewer showing information about processor used where you can find all registers, ports, interrupts in one convenient place for quick pick-up.

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