37id-login-form.html

<form action="https://launchpad.37signals.com/authenticate" method="post">
  <input name="product" value="YOUR-PRODUCT" type="hidden" />
  <input name="subdomain" value="YOUR-SUBDOMAIN" type="hidden" />

  <p>Username<br />
  <input name="username" id="username" type="text" /></p>

  <p>Password<br />
  <input name="password" id="password" type="password" /></p>

  <p><label><input name="remember_me" id="remember_me" value="1" type="checkbox" />
    Remember me on this computer
  </label></p>

  <p><input name="submit" value="Sign in" type="submit" /></p>
</form>

gistfile2.txt

The product and subdomain fields must be customized.

Product should be one of basecamp, backpack, campfire, or highrise.
Subdomain should be the subdomain portion of your account's URL.

Example for a Basecamp account located at http://acme.basecamphq.com:

<input name="product" value="basecamp" type="hidden" />
<input name="subdomain" value="acme" type="hidden" />