Not sure how exactly I came to miss this, but the newest Arduino IDE is out.

Version 0013

Windows, Linux (32 Bit), Mac

Biggest bonuses:

– Printing Floats

– Reduced Sketch size by not including unused functions

– Support for ATMega328, which is basically a 168 with double space.

From the release notes:

0013 - 2009.02.06 [documentation / examples] * Adding examples for Parallax Ping Sensor and Memsic 2125 accelerometer. [core / libraries] * Adding support for printing floats to Print class (meaning that it works in the Serial, Ethernet, and LiquidCrystal classes too). Includes two decimal places. * Added word, word(), bitRead(), bitWrite(), bitSet(), bitClear(), bit(), lowByte(), and highByte(); see reference for details. * Working around problem that caused PWM output on pins 5 and 6 to never go to 0 (causing, for example, an LED to continue to glow faintly). * Removing cast macros, since function-style casts are a feature of C++. This should fix contributed libraries that broke in Arduino 0012. * Modifying pulseIn() to wait for a transition to start timing (i.e. ignoring any pulse that had already started when the function was called). * Fixing bug in random() that limited the ranges of values generated. Thanks to Mikal Hart. * Modifying delay() to pause for at least the given number of milliseconds. * Fixing bug in Ethernet library that interfered with use of pins 8 and 9. * Originating each outgoing network connection from a different port (in the Client class of the Ethernet library). Thanks to Paul and joquer. * Updating ATmega168 bootloader to work with standard distributions of avrdude (responding to signature requests made with the universal SPI command) and correctly store EEPROM data. Thanks to ladyada. * Adding support for the ATmega328. The upload speed is 57600 baud, so you may need to edit boards.txt or reburn your bootloader if you bought an ATmega328 w/ bootloader from adafruit or other supplier. [environment] * Omitting unused functions from compiled sketches, reducing their size. * Changing compilation process to allow for use of EEMEM directive (although not yet uploading EEPROM data).

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0013 - 2009.02.06   [documentation / examples] * Adding examples for Parallax Ping Sensor and Memsic 2125 accelerometer.   [core / libraries] * Adding support for printing floats to Print class (meaning that it works   in the Serial, Ethernet, and LiquidCrystal classes too).  Includes two   decimal places. * Added word, word(), bitRead(), bitWrite(), bitSet(), bitClear(), bit(),   lowByte(), and highByte(); see reference for details. * Working around problem that caused PWM output on pins 5 and 6 to never go   to 0 (causing, for example, an LED to continue to glow faintly). * Removing cast macros, since function-style casts are a feature of C++.  This   should fix contributed libraries that broke in Arduino 0012. * Modifying pulseIn() to wait for a transition to start timing (i.e. ignoring   any pulse that had already started when the function was called). * Fixing bug in random() that limited the ranges of values generated.  Thanks   to Mikal Hart. * Modifying delay() to pause for at least the given number of milliseconds. * Fixing bug in Ethernet library that interfered with use of pins 8 and 9. * Originating each outgoing network connection from a different port (in the   Client class of the Ethernet library).  Thanks to Paul and joquer. * Updating ATmega168 bootloader to work with standard distributions of avrdude   (responding to signature requests made with the universal SPI command) and   correctly store EEPROM data.  Thanks to ladyada. * Adding support for the ATmega328.  The upload speed is 57600 baud, so you   may need to edit boards.txt or reburn your bootloader if you bought an   ATmega328 w/ bootloader from adafruit or other supplier.   [environment] * Omitting unused functions from compiled sketches, reducing their size. * Changing compilation process to allow for use of EEMEM directive (although   not yet uploading EEPROM data).