If you are like me and had the sad experience of purchasing an lpcxpresso
board (I highly discourage this, buy an mbed instead), I finally salvaged
mine.  The problem is, or at least was, you could only use this card
using a particular windows IDE/sandbox.  Perhaps there is a way to
program it from linux without whatever toolchain you like, but I have
not bothered to look for that anymore.  The lpc 1343 supports both a
usb and uart based ISP (in-system programming) way into the chip.  I
have used UART based before so that is the path I took.

Some soldering or at least wiring is involved here...

I took one of these ftdi breakout boards.

http://www.sparkfun.com/products/718

I cut all the traces between the lpc-link board and the target board,
no connections at all.  If you can/want cut the board and remove the
lpc-link and discard it.  You can always restore those connections
if you want to use the lpc-link again some day (some wire and/or solder
is required of course).  All connections from here on refer to the target
board.

Connect 3.3v on the ftdi board to 3.3v on the target board.
Connect RX-I on the ftdi board to TXD on the target board.
Connect TX-O on the ftdi board to RXD on the target board.
Connect GND on the ftdi board to GND on the target board.

On the target board you are going to need to be able to short p0.1 and
p0.3 to ground when powering on the board (or hitting reset if you add
a reset).  I used the prototype area for this with a removeable jumper.

With the jumper on, the two ISP boot pins shorted to zero, when powering
on the board by plugging usb into the ftdi board, tells the lpc1343 to
go into UART based ISP (In-System Programming) boot mode.

If you have followed any of my code you know how I do things.  The
proglpc directory is derived from the one in armmite_samples but hand
tuned for the ISP bootloader that I found on this chip.  armmite_samples
experienced version 2.1 in an lpc2103 and this lpc1343 I found version
2.5.  I have no interest in a one size fits all programmer, download
flash_magic or something like it if that is what you are after.  Or
you are welcome to take this code to understand how the ISP works, and
make a tool for everyone.  I dont know enough about LPC to know if
they always put the same version of bootloader in a flavor of chip
forever, or keep all families up to date.  Ignoring/skipping 0x0A
characters is probably the easiest way to resolve the differences I found,
you also have to support different crystal frequencies and ram addresses
depending on the board/device.

The mbed_samples repo goes into greater detail about using the gnu and
llvm tools for developing for a cortex-m microcontroller.  The
available memory on both boards starts at 0x10000000, but remember that
the GPIO ports and other registers do not necessarily use the same
address so take the mbed_samples as a reference, and apply them to the
lpc1343 until such time as I catch up with this repo.