I believe this was asked about before, but I did not find any reflector posts on this subject.
Whilst I can and do use Webmon from time to time to monitor the Spots page, it occurs to me that this is putting some extra load on the server. Each person using Webmon effective access the spots page twice, once when Webmon checks the page and again when you open it in your browser to view the changes (perhaps more if you then leave the page open in the browser as webmon is still checking the page in the background at whatever interval you have configured).
Would it not reduce the load on the server by having a RSS/XML Feed (another PHP script on the site that presents its output in RSS format) that is only updated by real changes in spots (not by the reflector summary displayed on alongside the spots).
The RSS Reader that I’ve used (actually a Plug-in for Miranda-IM) downloads the RSS page and displays it to you when it has changed, so only requires a single page download from the server at each checking interval.