Just for reference

[goldbug]

bookmark this if you find it informative:

http://sql-info.de/mysql/gotchas.html

[Merve]

This I find useful. Nothing is what it seems.

[drawmack]

book marked and I don't do that often

[LordShryku]

Bookmarked and emailed to everyone around at work who says MySQL is sooooo great. Thanks goldbug

[Weedpacket]

Just in the interests of balanced reporting (and so that people can compare the lengths of the lists and severity of the items ;)):

http://sql-info.de/postgresql/postgres-gotchas.html

[silent]

That's a pretty extensive list.
Definately going to keep that handy... thanks!

Some of those are pretty damned silly :)