I have written about the (hidden) possibility of exporting references from Google Scholar before, but since several people have asked about this lately, I will post a more detailed description of how you can do that here. It is very simple:
1. Go to Google Scholar
2. Select the Scholar preferences:
3. At the bottom of the preferences page you find a menu where you can choose which reference format you prefer (BibTex, Endnote, Reference Manager, etc.)
4. From now on, when you do your search you will see a link saying “Import into [BibTex, Endnote, etc.]”:
5. Click on the link, and you will get up a new window with your reference formatted according to your personal setting.
6. Copy the reference, and paste it into your reference manager (in my case BibDesk). Since Google’s automatic reference extraction isn’t always perfect, I often end up having to fix the reference a bit to get it correct. But this method still saves a lot of time and effort!