This article was submitted here nearly two years ago (as you will find out if you click the link to the HN discussion at the bottom of the article). But I thought of one not included in the article.
From Portland's Wikipedia page:
> On the west side, the RiverPlace, John's Landing and South Waterfront Districts lie in a "sixth quadrant" where addresses go higher from west to east toward the river ... East-West addresses in this area are denoted with a leading zero (instead of a minus sign). This means 0246 SW California St. is not the same as 246 SW California St. Many mapping programs are unable to distinguish between the two.
The city deserves a "bug" for that. Computers might not be able to distinguish between those easily, but I'd bet most humans (especially ones not from Portland) would have no idea either. Addresses are not set in stone -- it's easy enough for them to fix and avoid the entire issue.
edit: I've had my zip code changed within the last few years. That causes the same amount of pain as changing any other part of the address and is done without much fanfare.
From Portland's Wikipedia page:
> On the west side, the RiverPlace, John's Landing and South Waterfront Districts lie in a "sixth quadrant" where addresses go higher from west to east toward the river ... East-West addresses in this area are denoted with a leading zero (instead of a minus sign). This means 0246 SW California St. is not the same as 246 SW California St. Many mapping programs are unable to distinguish between the two.