You can filter your assets based on location by going into settings and clicking on Assets. Under the section for 'Computer Assignment Rules' you can set up a rule that automatically assigns computers in a certain domain, IP address range (using wildcards, e.g. 10.1.*.*) or by external IP address to a specific site. This has been very useful in getting statistics for how many computers are in any given site at any one time, or for keeping track of where people's kits are.