If you are backing up multiple computers to a single Time Capsule, and one of the machines decides there isn't enough space to complete a backup, try compacting the other backups - especially if they are quite large.
Open a Terminal and the following command:
# hdiutil compact /path/to/backup/sparse/bundle
I did this on the backup of my machine, when another laptop was deleting old backups trying to make space, and it freed up over 90GB of space. Plenty enough to allow the other machine to complete it's backup.
I turned off automatic backups while it was running - remember to re-enable them afterwards.
This is something that Time Machine will run itself if it's runs out of space, but it will only compact the backup for the machine that it is running on, so if there is a potentially large amount of free space in a backup for a different machine that won't get reclaimed. Instead the first machine will start sacrificing it's older backups to make space.
Note: I'm running Time Machine on OS X 10.6.6
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