Ever try to copy and paste items from Google Calendar into an email? The results aren't pretty, and hard for others to install in their own calendars. Save everybody some time with PubMyCal, which sucks in calendar feeds and spits out clean emails, with links.
After signing into PubMyCal with a Google or Google Apps account, you pick the calendar you want to pull from, and choose two dates to create a range. Enter an email address to send to, and you're done. That person gets a nicely formatted list of times, dates, and event details.
They also get links to your calendar events, but if you haven't shared access to your calendar, or set it for public viewing, they'll arrive at an access denied page. But that's the only drawback, and it's really not a problem in most cases.
PubMyCal is free to use, no hitches or sign-ups needed, other than authenticating through Google.
Zapaday is a free global events calendar you can tap into to find out what's happening soon, from holidays to cultural events and news. Zapaday scrapes 4,000+ news sites for future events and also pulls in important public calendars. 
If you routinely plan events, you may find that SignUpGenius can help make the execution of your plans easier. Using the webapp's 5-step wizard you can create a variety of electronic sign-up sheets that you can email to potential attendees. 
iOS: Roamz is a new mobile app that uses your social networks and your location to help you discover activities, restaurants, attractions, and other venues near you, wherever you may be. Whether you're at home and want to try a new restaurant, or traveling far from home without a clue of where to go to unwind, Roamz can give you suggestions based on what everyone nearby is buzzing about. 
