Here's a tip to fledgling start-ups: If you've got a huge list of e-mail addresses from people who are interested in trying out your service, don't forget to send out your pre-announcement as a blind carbon copy (bcc).
Blummi, a service that's due to open up its public beta in "the next few months" did just that Friday morning. Now I've got more than a hundred strangers able to send me, and everyone else on the list an e-mail with just a click of a button--a few already have.
The service is reminiscent of Brightkite, a location-based social network that . Where it's got potential is for both providing a way to sort out Twitter contacts by group, and help you discover people nearby who share your interests. If Tapulous' Twinkle has proven anything, this can make discovery both creepy and engaging at the same time .
Here are some of the other planned features (via the mass e-mail):
Organize your followers in groups like family, friends or contacts
Create different kind of 'spreads' like message, poll, link, review, event
Share your 'spreads'/tweets
Comment images, links, polls and see who will join your events and what your followers are planning to do these days
Discover how far away your followers are or what they are interested in
Meet new friends with same interests (Blummi will bring you together)
Use your mobile device to stay in touch with your followers, to take and share images, to shout out where you are
Add privileges (e.g. can see my exact location or can see only my city) to your followers groups
Control if your followers have read your tweet
You will be informed if a follower is close to your location
Discover what's going on around you
We'll have a hands-on when Blummi launches later this year. In the meantime, I think it's safe to use the beta sign-up form, as the creators have issued a smart apology--with bcc on.