Stocktickr.com is a free online community of stock trading enthusiasts. As you add stocks to your personal stocktickr portfolio, you assign tags to the stocks, much like tags are used on del.icio.us. Stocktickr automatically tracks the performance of your stocks and reports stock performance displayed by each individual stock or by your tags.
I could not always click through on tags using my Firefox browser, but could reliably click through on Stocktickr tags using Internet Explorer. This could be due to a plug-in I use with Firefox, but can't be certain.