Full Hard Drive, Need to Delete from DVD Startup

My MacBook/Leopard crashed today while I was in the middle of using it because the hard drive filled up.
When I turn it on now, all I get is the gray screen with the Apple symbol and the spinning loading indicator.
I tried booting into safe mode, but this also got stuck on the start-up screen.
I was able to boot off the Install DVD. I went into terminal and tried to delete some files out of /Volumes/Macintosh HD using the rm command. When I tried to do this, it told me "Read-only file system."
I've been reading on the Internet that I might need to mount the drive to be able to do this, but I can't figure out how to mount the drive.
When I type in "mount", one of the things output is:
/dev/disk0s2 on /Volumes/Macintosh HD (hfs, local, read-only)
I assume this is what I need to mount? Please help, thanks!

there must be a problem with the file system. the disk should mount with write option otherwise. that's what you get for overstuffing a hard drive. you should keep at least 20% drive space free to avoid problems resulting from disk fragmentation. directory damage is one such problem and I suspect this is what happened here. while booted from the DVD start disk utility and repair the drive. then unmount and remount it in disk utility and try trashing some stuff from it again using terminal.

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