Over at 37 Signals, the post that inspired Tim’s widget (see previous entry here) discusses how tagging has been implemented in any number of ways at different popular sites.

Should tags be separated by spaces? If so, then how do you indicate multiword tags (hyphens, underscores, CamelCase, quotation marks?), or should tags be separated by commas (my preference)?

When each tag box you encounter does things differently it’s hard to keep know what to do.