Can anyone point me towarda a link with decent info on what IT technical staffing should be in terms of in-house network, computer, OS and software support per employee. That is we have around 100 employees, about 30% of them developers of one sort or the other , also a lot of marketing people.

My feeling is that between moving forward type stuff (web farm migrations, server upgrades, database upgrades etc..) , high level maintenace (network problems database problems, OS problems, and standard maintenance (a marketing person can't figure out how to do something in Excel, we need to upgrade Ram, or a hard disk, or burn our standard station config into a computers) that we need 3 people at minimum -- that reducing support staff below this would be a very bad idea.

I'd like to get hold of some sort of benchmark for high tech companies, so I can figure out if three support staff for a 100 person company is low or high compared to standard in-house support staffing levels for companies with this level of computer usage. (Everyone has at least one computer. Most of our tech and graphic design people have two computers each.)