Just wanting to get Lion DP1 onto disk so I can use it on a fresh install.

Last time I used partition but this time I need to boot and install on a proper machine.

Yup. This is the tool I've used to do it before:
http://en.kioskea.net/download/download-1428-dmg2iso

That'll output an ISO file that can then be burned using any standard Windows burning suite.

^ Big thanks for that! I tried another program called MagicISO but that turned out to be a paid program, despite everyone telling me it was free!

MagicISO is a paid program but fully functional in the trial version.

Only up to 300MB.

is this bootable when converted to iso? planning to use it on iportable snow

Yup, works like a charm. I now have Lion on my old Macbook Pro.