There should be a warning message that there is not enough filespace available when trying to write an iso file.

Other information:
The behaviour occured on two different computers running Ubuntu Edgy.

Here are a few lines of output from
strace nautilus-cd-burner 2>/tmp/nautilus-cd-burner.log


read(3, "\1\0M\v\0\0\0\0-\334\240\0\0\0\0\0\0\0\0\0\4\0\0\0<\25"..., 32) = 32
gettimeofday({1166669210, 25767}, NULL) = 0
writev(14, [{"l\1\0\1{\0\0\0\21\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/"..., 144}, {"v\0\0\0type=\'signal\',interface=\'org"..., 123}], 2) = 267
gettimeofday({1166669210, 25922}, NULL) = 0
poll([{fd=14, events=POLLIN, revents=POLLIN}], 1, 25000) = 1
read(14, "l\2\1\1\0\0\0\0\6\0\0\0005\0\0\0\6\1s\0\5\0\0\0:1.28\0"..., 2048) = 72
read(14, 0x80ad798, 2048)               = -1 EAGAIN (Resource temporarily unavailable)
close(14)                               = 0
close(16)                               = 0
writev(13, [{"GIOP\1\2\1\5\0\0\0\0", 12}], 1) = 12
close(13)                               = 0
writev(11, [{"GIOP\1\2\1\5\0\0\0\0", 12}], 1) = 12