TopTenReviews, the leading comparison website that specializes in in-depth side by side reviews in the really competitive fields out there like in software, electronics, web services and more, just gave Clarizen a huge endorsement as the #1 Online Project Management Solution.
If you don’t mind, I am going to take the summary of their review and add my own annotations… I also included here a link to TopTenReview's video review - worth a view.

From TopTenReviews:
Pros: Clarizen’s easy-to-use email-style formatting runs from an online server instead of your computer, which allows access from anywhere. The program also utilizes a Roadmap for effortless navigation and management of projects.
My take: Easy to use?? Paallleeez, that’s an understatement. The familiar looking interface will help get people up and running in no time. Plus we offer great daily online webinars to help you through more complex scenarios that will boost your productivity.
SaaS – access from anywhere is really a key differentiator from last generation solutions like MS Project. A SaaS business model offers you unique advantages, allowing you to collaborate within your organization as well as with your partners, suppliers and customers and focus on successfully managing your projects rather than worry about purchasing, installing and maintaining software or hardware.
Roadmaps – you ain’t seen nothing yet! Version 4.8 is about to be released with great new features to the Roadmap functionality including a widget capability that can be plugged into your company’s portal or intranet, giving everybody real time visibility into the status of the selected projects.
From TopTenReviews -
Cons: There are so many features that some may feel overwhelmed with all the possible options.
My Take: This is actually pretty true. Although it is not always fun to be critical of ourselves, we have taken a good look at ourselves and the platform and have realized that we have a hard time saying no to functionality and as a result have kept adding more and more functionality in each release. This has lead to some very happy customers who have asked for specific functionality to be added, but it may has also led to a slightly overwhelming user experience that could take some getting used to.
Which is why our next several releases are being focused on simplicity. We have set aside a chunk of development time to focus on simplicity and clarity in order to make the functionality and usability clearer and more intuitive to any level of user. The mock-ups of the upcoming releases are incredible. It will pave the way to an entirely new level of project management.
From TopTenReviews
The Verdict:Innovative Roadmaps and a familiar layout helps Clarizen stand out and will be sure to help you manage any project with ease. We highly recommend this product.
My Take: Great review, right on target, what else is there to say?