I have posted this in another thread but I thought I'd also post this here.
I have got he Optiboot boards to appear in the Arduino IDE.
What I did was create a Hardware folder in my sketches folder. Then added an optiboot folder which contains two folders bootloaders and cores and also boards.txt.
I then just copied everything into both bootloaders and cores - I guess these ought to be split out some how. I have NOT had chance to test this yet...
So I have
[ArduinoSketches]
|
- optiboot
| - /hardware
| - boards.txt
| - /cores
| |
| + [files]
| - /bootloaders
| |
| + [files]
|
[editied becaue I missed out the optiboot folder]