If you use Google's Gmail then you can do the same type of thing using this nifty "+" sign technique. Simply add something extra to your email username to define which service or special offer you're signing up for to find out which websites are selling your email address to marketers. For example, if your normal email address is firstname.lastname@example.org and you're signing up for a competition with Little Goliath Ltd you would provide your email address as something like email@example.com. Thereafter, any emails arriving in your inbox to that very specific email address indicates who sold your email address to who.
Email Framework is a useful-looking set of HTML templates, aimed at helping you build your own bulletproof, responsive HTML emails. Covers a range of handy areas, like mobile hacks, typography, buttons and images.
Get a deeper insight into your online competitors by following the suggested steps in the article Why you should spy on your online competitors and use that information to improve your own online success. Covering a range of useful angles from first determining who your competitors are, to understanding what makes them successful, what they write about on their blog, what's popular and who links to them.
Google+ Hangouts let you do cheap teleconferencing for up to ten people; this includes using live video as part of a demonstration. Hosting a Hangout on a subject relevant to your business is a great way to:
Demonstrate a new service or product
Get feedback from your customers
Increase brand recognition
Build a stronger following
Enhance your position as a leader in your field
All Hangout conversations are saved for future reference, letting you revisit shared ideas and images.
If you send out email newsletters then you should read Email Marketing Strategies that Actually Work. It's packed with lots of good advice on things like understanding your subscribers, the importance of writing a strong subject line, analysing statistics and responding appropriately.