I would recommend that you use the uid= and gid= options in your fstab entry. This will allow you full access to the partition yourself, (uid=<your user name>) and to be able to control which users have access to the files. For the latter part, you might want a umask of 007 or something similar to deny access to 'others' for new files created.
These two options exist because you can't use chmod with a mounted vfat partition. But you can set the owner and group in the mount command.
Also, doing it this way will automatically mount the partition for you, so you don't need to mount or remount the partition to gain access ,as in the user option..
So if your user name is 'hippy2981', the fstab entry might look like this:
/dev/hda8 /share vfat defaults,uid=hippy2981,gid=fileshare,umask=007 0 0
Mandrake Linux has a fileshare group for the purpose of controlling access to shared partitions, which is why I used the name. Debian may have a similar group. However, you can create your own group for this purpose. For example, imagine parents having their correspondence and records on a separate partition. Both mom and dad share this partition, but the files are to important, or private, so they don't want the kids to have access. Creating a 'parent' group would allow controlling access. They may have a second group called 'family' which is used to share files amongst everyone in the family.