Struggling to Find Right Web Apps

I apologize in advance if this question has already been posed a million times - I’m a newbie to online productivity suites.

I’ve recently migrated to Google for nearly everything, including email, scheduling and task management, and RSS reading. However, I’m still struggling to find a way to meet all of my productivity needs online.

Does Google offer anything similar to a personal wiki that I can use to capture thoughts, links, etc? Is this what Notebook is for? If so, it seems clunky as best.

I’m tired of having to toggle between iGoogle, Zoho, and other apps just to get things done.

What are my options? Should I upgrade to Google Apps? Install a wiki at my domain? I’m lost!!