Just released earlier this month, but potentially Pageflakes will be the most open of all the AJAX homepages. It offers standard modules (which it calls "flakes") like blogs, news, search, note, Flickr, Del.icio.us. There are more modules in development by Pageflakes, third-party developers and "content partners". It's developer page lists a broad range of options for developers to build modules, so this is a promising start by Pageflakes. [...]
Among the smaller companies, Pageflakes seems to be the most promising with its API support. [...]
He also writes about the same topic on his (must-read) ReadWriteWeb blog. Among other things, he has a look at the Alexa traffic charts of the different players. One of his interesting observations is this:
Update: A source at Microsoft tells me that the Live.com figure on Alexa may include mail.live.com, which gets a lot of traffic. If that's the case, take the following paragraph with a grain of salt...
I recently noticed that Live.com, while unsurprisingly having much more traffic than the start-ups, isn't bookmarked more frequently than Netvibes and Pageflakes on Del.icio.us. I was wondering if Live.com may have a lot of traffic (very easy to achieve for Microsoft) but few real users who actually bookmark the site and come back? Richard's observation might be an explanation for the discrepancy between the Alexa numbers and the Del.icio.us numbers. Maybe Del.icio.us bookmarks are a better proxy to guesstimate another site's user base than Alexa after all?