I run a Linode 512 for the NWS Wakefield SKYWARN Amateur Radio Support Team. We have about 100 user accounts now, projecting about 200 in another year. A mix of ham radio operators and local emergency managers across parts of three states.
While our @wx4akq.org e-mail is handled first by our Linode, most users are forwarding to Google Apps Mail. We were originally using the Google Apps platform for a lot of what we do but are transitioning off of it. Users with accounts there already will be allowed to keep them (an @g.wx4akq.org domain alias was set up to allow easy forwarding to Google). Users manage their e-mail and forwarding, plus Spamassassin filter settings, through a custom control panel upon login to our Operations Portal.
Our public-facing web site-
http://www.wx4akq.org/ - plus a special site geared toward the emergency management community are also hosted on our Linode.
We use the Linode-based Ops Portal to receive and log reports from storm spotters via our radio networks. These reports go into a MySQL database and are held for a short period before being released directly to the National Weather Service. We also have the capability to query our logs via a two-way radio messaging system in the event of internet failure at the Forecast Office.
You can take a peek at some of the behind-the-scenes stuff here:
https://docs.google.com/document/pub?id ... ENhyelg6HU
The Linode is also driving an EMWIN (Emergency Managers Weather Information Network) ingest system, which fetches every available weather product from the National Weather Service Telecommunications Gateway (NWSTG) via FTP once every minute. The text products are received as a zipped batch of text files-- anywhere from a couple to a few hundred at a time. They are then individually parsed by product type, location codes, issuing office, expiry, and checked for dupes, then indexed in a MySQL database. From there, location-specific e-mail alerts are generated for our team members. The full EMWIN feed is available for public access at
http://emwin.wx4akq.org/.
Lastly, our Linode drives two VoIP systems and an IRC service for our internal use. The first VoIP system is FreePBX, powering our peer-to-peer telephony, our public-facing toll free access number, and a local 24/7 Weatherline that receives its audio directly from the NOAA Weatheradio systems over the Internet. The second VoIP system is TheBridge, which is an Echolink conference server, used to link amateur radio communications systems together (as well as direct computer users). This allows us to tie multiple radio systems together during large-scale events.
So, our little Linode 512 gets quite a workout and performs admirably! Disk space is getting a little tight so we'll be bumping up to the next tier soon.