If you send me an email, I'll likely keep a copy on my machine. I'll likely send you a response if appropriate. If I start a new project that might be of interest to you (based on your email), then I might send you a notice.
I'll not give/sell/rent your email to any organization.
Once upon a time I gathered email addresses (via a form) for webmasters who registered, so I could send notices of when I updated data. Quiz stats were (and still are currently) sorted by registered referrers. However, maintaining this service got to be too much work so this has been terminated. When I get around to it, I intend to turn off this sorting.
If you don't like all this tracking, then you need to quit using the Internet, move to Montana, and wear an aluminum foil hat to block the microwaves.
Just kidding. Your browser has settings to block cookies. But blocking all cookies means you won't be able to log into many web sites, and asking for a prompt will drive you crazy.
Fortunately, newer browsers have advanced features such as blocking cookies from third party sites, erasing all cookies after each session, and/or having different cookie policies for different sites. Look under Edit/Preferences on Mozilla based browsers or Tools on Internet Explorer. Then hunt around for "Privacy" and "Cookies". And see the update!
Update (April 2009)! Google has now implemented "interest-based advertising." That is, Google is now tracking your path across the web through the cookies placed by Adsense (and possibly other services). This allows Google to serve ads based on your interests vs. just the info on the page you are looking at. If this disturbs you, you can opt out of this and other similar ad tracking systems.