indeeed the new imgburn is really noob-proof. the 'E-Z' picker shows 'Write image file to disc'.
selecting the right image shows name in the source box 'osx-leopard105.iso'
the log is reproduced below:
13:52:46 ImgBurn Version 2.4.0.0 started!
I 13:52:46 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 2)
I 13:52:46 Total Physical Memory: 3,406,860 KB - Available: 2,805,300 KB
I 13:52:46 Initialising SPTI...
I 13:52:46 Searching for SCSI / ATAPI devices...
I 13:52:46 Found 2 DVD-ROMs and 1 DVD