Concepts – Creativity - Research
http://faveup.com/ - Logo ideas
http://99designs.com/ - Get artists to design a logo to your liking.
http://www.domaintools.com/ - Registering domains, look ups, with a list of domain registrars cheaper than $9.
http://StumbleUpon.com – Creative ideas on many topics if you just can’t think of one on your own. Inspirational.
http://smashingmagazine.com - Excellent content and a bunch of cool freebies.
http://www.coolwebsiteideas.com/ (maybe not so cool)
http://www.dailybits.com/11-undiscovered-website-ideas-to-steal-and-make-you-rich/
http://webmastercourse.com/articles/101/personal/
http://www.google.com/insights/search/# - See what people are searching for on Google
http://www.associateprograms.com/articles/63/1/Where-to-get-ideas-for-a-niche-website **

Planning
http://blog.deskera.com - DeskEra interoperates wonderfully with popular Project Management softwares like Microsoft Project®. It lets you export/import to & from Microsoft Project®. (down at the time of posting)

Collaborate:
http://www.basecamphq.com/
https://website.qtask.com/index.php
http://mashable.com/2007/07/22/online-collaboration/ 60+ collaboration tools.
http://www.sharepoint.com Not directly a web app but still good.
http://www.activecollab.com/ with api
http://www.skrbl.com/ - Allows the user to write graffiti on uploaded images and embed them into a site via iframes.
http://grouploop.com - Simple web-based software to organize your committee. Group messaging, calendar, file sharing, RSVP system, and more!

Even though this is little off topic I wanted to bring this to you all. I’ve been using Visual SourceSafe and lately Team Foundation Server for change management. Even though Team Foundation Server seems to be a lot better than Visual SourceSafe still I felt a lot better with Subversion. I’ve used that before and it boasts quite a few of features that’s missing on it’s Microsoft counterpart. For those of you who haven’t seen what Subversion means, here is a video from Dan Wahlin that will make you Subversion aware.

Getting started with Subversion and Source Control