1) Never put the person's name in the To field until you are finished writing the email. That way you can't accidentally send by mistake.

2) Always insert your attachments before you do anything. Then you won't forget them.

3) When writing an email with an angry tone always let it sit for a few hours or overnight and re-read it before sending and follow rule number 1 too. Less regrets that way.

Try www.shoppingnotes.com. This neat site lets you add items from all over the web to your own shopping list and then notifies you when the item changes price or hits your specific target price. You choose which option you want. There is also an "add to toolbar" so you can do it quickly without the hassle of copying and pasting the url.