Google has added a slew of new features to Google Docs, Google Sites, and other products, but the new features in Gmail win my vote for best upgrades this week. Now you can make multiple-line conference calls from Gmail for free or reduced rates (free to the US and Canada until the end of the year, reduced rates everywhere else). Combine that with a shared Google Doc, and you've got an office meeting.
On top of that, Gmail has also added new layout options and features designed to cut down on phishing and virus attacks. If you get an email from someone not in your contacts list, you'll see the full address, and you'll also see an alert if it appears that the email address has been spoofed. You can also view the contents of .zip and .rar files without downloading them. That cuts down on the risk that you'll download a virus masquerading as a legitimate attachment. Google learned the hard way just how dangerous malicious email attacks can be when their own computers were compromised by targeted attacks.