Here are some very useful (imho) tools you might like too.
activeCollab is a project management & collaboration tool that you can set up on your own server or local network. Work with your team, clients and contractors in an easy to use environment, while keeping full control over your data.
Autoresponders: aWeber | Get Response | Traffic Wave
Autoresponders are the lifeblood of every successful business. They can automate a very big part of your business and generate sales around the clock on autopilot for you.
aWeber is the choice of professionals with probably the highest deliverability in the industry. Their fees are higher and their commission plan is more limited than Traffic Wave, but a good choice for a quality autoresponder.
Get Response is another quality autoresponder.
Traffic Wave offers unlimited autoresponders for a low monthly fee plus you earn monthly commissions down multiple levels. They offer a 30-day free trial.
Google Apps: Website
Simple online messaging and collaboration tools. Reliable, secure online applications wherever you work. Google Apps reduces IT costs and empowers today's employees. Gmail, Google Docs, Google Sites, and more.
Use the features of Gmail with your own domains. Check out the standard edition for a free version.
Help Desk Software by h2desk. It's a new and modern version of the former PMOS software, with new/updated features and some features others don't have. Brings your customer service to a whole new level.
OpenDNS makes your networks more secure and more reliable. Ultra-reliable, globally-distributed network, industry-leading Web content filtering. Easy to use for families, schools and businesses of all sizes.
Say good-bye to DNS problems for good.
Rainlendar is a feature rich calendar application that is easy to use and doesn't take much space on your desktop. The appearance can be customized with skins and it's possible to use Rainlendar with other calendar applications too. Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between applications. You can also subscribe to online calendars and task lists including the Google Calendar, Remember The Milk and edit your Outlook appointments directly in Rainlendar.
Safelists and List Builders: Affiliate Funnel | Traffic Hoopla | Viral Mail Profits
Email Marketing is the #1 most powerful way to boost your traffic and skyrocket your profits. Safelists and list builders allow you to send your emails out to thousands of marketers for free and you never have to worry about spam complaints. To learn more about safelists and list builders you can check out Safelist Marketing Tactics.
Traffic Exchanges: Affiliate Funnel | Traffic Hoopla | Traffic Tornado | Vital Viral Pro
Traffic Exchanges are a great way to drive some free traffic to your sites. A traffic exchange is a system where advertisers earn 'credits' viewing ads of other members, so that their ads can be shown. The process of viewing is called 'surfing', and the viewers are called 'surfers'. To learn more about traffic exchanges you can check out All About Traffic Exchanges.