Are there any webapps for sharing contact information?

Are there any good webapps for sharing contact details with friends AS WELL AS people I'm doing business with?

I know there are programs out there like Bump which make this process "fun" and "easy" but I want some other suggestions. I don't always find others who use Bump and I'd like to know what you all think is the best way to get your contact info shared with other people. I'm obviously looking for apps which are accessible via the web as well, but if they have mobile phone apps which extend the service (or even offer "off-the-grid" solutions), that's great, too!

**EDIT: I'm mostly interested in solutions which don't require the recipient to be part of any membership network to receive my contact info.

From web app Michael

• Plaxo is the first one that comes into my mind. Also, take a look at Contails.

  Michael : I added some clarification to my question since some meaning was removed in an edit. Plaxo is very business oriented and has a members-only model which make it hard to share with people who don't use the service. I'd like to avoid these attributes if possible. Thanks for the suggestion!
  From Alex

• I don't know of anything that works exactly the way you want. You might look up WP Contact Manager for Wordpress (http://publisherblog.automattic.com/2008/02/13/wp-contact-manager) or you might try digging around for services using Portable Contacts (http://portablecontacts.net) and/or Webfinger (https://code.google.com/p/webfinger).

  Michael : I looked really hard for that Contact Manager Theme, but it looks like it changed to a SaaS type model. REALLY appreciate the Portable Contacts link. It seems like the sort of protocol support I should be looking for in a provider. Thanks.

  Michael : Of all the solutions, the Portable Contacts protocol gives the most promising way of fulfilling my needs. Thanks again!
  From joshuasbones

• You can use Contxts to SMS your "business card".

  Michael : This also sounds like a really great solution. Probably the closest one to what I'm looking for. Don't like the fact that you can only link up profiles if they belong to the same network, but I guess beggars can't be choosers.
  From Adam

• Try http://www.unyk.com/

  Michael : I appreciate the suggestion however unyk.com seems like another take on Plaxo. I'm still playing with it, but I'm doubtful. Thanks still!
  From tinmaru

• Most contact info applications (Outlook on Windows, Address Book on Mac, etc.) support a data format called VCF or vCard. Export your card as a .vcf file, then place that file on your blog or business website. You can now give a link to users; when they download the file it create a new entry in their contact application.

  How to export your vCard:

  Address Book On Mac:

  1. Open Address Book
  2. Find (or create and save) your entry
  3. Right click on your name, select "Export vCard..."
  4. Save your vCard

  Outlook on Windows:

  1. Open Outlook --> Contacts
  2. Find (or create and save), then open your entry
  3. Select "File" --> "Save As..."
  4. In the dialog box, locate the "Save as type" dropdown menu
  5. Select "vCard Files (.vcf)"
  6. Save your vCard
  Michael : The vCard format is a nice solution, however there are many aspects which work against it. You need to download and import that card into whatever software you use and then have to update the vCard anytime the owner makes changes (which hopefully you're somehow made aware of, somehow). This alone makes it less appealing than any of the other options presented. Likewise, it still has its place in someone's workflow. Thanks, though.
  From Jerry H.