Lpc2000

On the note of needing the extra I/O pins, if you really need them why 
not just throw on an 74LVC343 or something similar?  You can 
effectively get 7 additional digital I/O pins, with enough current to 
source LEDs if need be.  I've added a few to my design for anything 
that is not performance critical, and it works great.  This way I 
leave the JTAG pins for their useful purpose :)

Alternatively if the $0.25 for the latch is too much then you can add 
a latch as a replacement for the jtag pins for debugging purposes 
only, and for production you can remove the latch and change the 
control to the JTAG pins instead.  For simple "fool-proof" things like 
LEDs or peripheral chip selects this can work quite well.