We’re in the AJAX and XHTML age.
Please spend a little more time on going through your code, to make sure it can pass through a validator.
Missing one or two things, but generally getting the rest right is to be expected, and doesn’t bother me.

What gets me is the ampersand.
People seem to forget that in XHTML, the ampersand needs to be escaped, or changed into an entity.
It’s not just the ‘&’ by itself now. It’s now an ‘&’ when you’re putting links in that perform queries, like the social bookmark plugins generally do.

Please, please, just remember to do that, and it’ll spare me an extra five or twenty errors per page when I try to validate it.
Thanks.

[tags]XHTML, PHP, WordPress Plugins, Ampersand, Valid Code[/tags]