Personally I use iGoogle daily simply because of the Gmail/Calendar integration (don't need to open anything else to see those) right on the first page I see when I open my browser. It allows me to start my day at one glance: new emails, daily events, and RSS feeds of overnight news. When I switched to it, I was previously using Netvibes. I switched because it loaded roughly 5x faster than Netvibes.

There are some things I don't like about it. The header is gigantic. I wish I could turn that off and add a few more feeds without needing to scroll. iGoogle has also been breaking a lot lately. I actually removed my Gmail feed simply because it never worked even though it was developed by Google themselves.

I'm sad to see it go, but it's better than the sorry state it's been in for the last few years.