steveb - 8:49 am on Apr 21, 2005 (gmt 0)

"I'd be curious to hear of any remaining canonicalization issues"

Okay, it's not a 302 one, but I've been thinking of it as a similar "canonicalization issue"...
Google's database is overflowing with URL listings like:
www.site.com/directory
where there is also a normal listing for
www.site.com/directory/
These occur from the trifecta of the unfortunate Google policy of URLs-are-pages combined with the bajillion puke scraper sites that scrape search results, where both Yahoo and MSN display results without the trailing slash
It's my experience that when a page gets a second URL only listing, it drops in the results, which would then end up penalizing pages without a file extension, particularly if they are popular and get scraped often.

These URL only links fade fairly quickly, but still it would be nice to see Google recognize and combine these with the canonical page, rather than seemingly demerit the canonical page.