When looking through this page, I've noticed a tendancy for many extensions to add their namespaces starting at a multiple of ten, where no other extensions already had any namespaces in that block of ten numbers, thus effectively "claiming" the block. This seems like good practice to me; should we codify it as a general recommendation on this page?
If so, it can be retroactively applied to the extensions already documented here that don't align themselves witha multiple-of-ten namespace number; the only documented problem areas are the 48x and 80x/81x numbers (plus the 10x/11x, but that's to be expected given how low the numbers are). This could be done simply y reformatting the page to designate according to groups of ten numbers, instead of by extension, while more-or-less leaving the problem ranges alone.
(Note that this would be a really good time to point out extension-added namespaces that aren't documented here yet, regardless of whether they'd create more problem ranges or serve to reinforce the observed pattern. =) )