Give them a test. The tags never cause me problems ever. If there's no closing tag, then nothing is parsed, simple as.
I will update soon with some images and brief instructions on how to add them as standard editor buttons if you like :)
Cool, I'll add that button soon. But I like <strike></strike> simply because it's easy to read in one's bbcode manager. I'm considering switching it to your version however because I admit I'm not very familiar with these standards.

Can someone provide buttons for these codes?

shoudnt the PIE TAG be lowercase in its code? <tr> instead of <TR> so that it wuld be xhtml compliant?

Excellent stuff ! Thanks

Everyone asking about buttons to use these codes, I updated. Upload the new attached file with the button images and be sure to use the correct "Button Image (Optional): /images/???" field when managing your bbcodes and you'll add them to your editor!

Keep them coming :)

I asked for this at vBulletin.com & they said it cannot be done: How can I place images for new custom BB codes where I want in the editor's interface? Now they're been added to the right.

Also, can I integrate them into the WYSIWYG interface mode, so they appear visually on the edting area, not between [][/] tags?

Thanks for the Credits. I still use my Tag.
Good Work.

First Time I posted the sign-Tag was in the Thread "I share my BB-Codes" in the vBulletin.com Forums months eralier.

I remember that thread. Some guy told me on it about the tables thing not being safe and I felt like repeating it.

How about a horizontal rule BBCode?