dont want to toot our own horn - so please dont take this as advertising - especially since we dont take any clients on - just Christian churches...
our help section however has 2 links to some tools that are good:
Public Looking Glasses - over 20 to choose from:
http://support.vinehosting.com/index...id=93&nav=0,21
Route Servers - over 20 to choose from:
http://support.vinehosting.com/index...id=91&nav=0,21
Also for speed tests:
web100 based Network Diagnostic Tool:
http://miranda.ctd.anl.gov:7123/