Email is still a viable solution. Also, there is a plethora websites that host characters sheets for easy reference.
<a href="http://www.myth-weavers.com/forumhome.php" rel="nofollow">http://www.myth-weavers.com/forumhome.php</a>
Mythweaver is an example website that hosts characters sheets.
Also, there are campaign management website like Epic Words or Obsidian Portal that do a whole lot more than just character sheets. Epic Words offers a limited free account.
<a href="http://www.epicwords.com/" rel="nofollow">http://www.epicwords.com/</a>
<a href="http://www.obsidianportal.com/" rel="nofollow">http://www.obsidianportal.com/</a>
Also, you can also create your own free wiki or forum to host your game, characters, and anything else. Here are a couple of examples:
<a href="http://www.wikidot.com/" rel="nofollow">http://www.wikidot.com/</a>
<a href="http://www.proboards.com/" rel="nofollow">http://www.proboards.com/</a>