Office 2007 is a nice upgrade but there was something that it would drive me nuts every time I'd make a new Word Document; the default line spacing and default paragraph spacing in Word 2007 differ from the default spacing in earlier versions of Word.

Every time I'd press enter it would be as if I would press it double and I couldn't write on that line. No biggie, I could always select the second style and it would fix it but it was proving to be a PITA for every new Document I would make.

I finally found an article by Microsoft (http://support.microsoft.com/kb/921174) and it works really simple, there's even a Fix this Problem download that you can get from there to fix it. To fix the line spacing and paragraph spacing in Word 2007 so that it is the same as in earlier versions of Word, you have to change the Style Set option.

To do this, follow these steps:
1.   Click the Home tab.
2.   Click Change Styles in the Styles group, point to Style Set, and then click the style set that you want to use.

To change the default formatting of your document, such as the line spacing and paragraph spacing, to the default formatting that is used in earlier versions of Word, click Word 2003.

3.   To set the style set as the default style set in Word 2007, click Change Styles in the Styles group, and then click Set as Default.

And that my friends is how you do it! Hope this helps someone to keep their sanity, I know mine was in question a couple of times due to this.