please review our online load testing service - loadimpact.com
asnyder: This is a good start, though not as comprehensive as we're used to. Currently we use WAPT which is significantly more comprehensive while still maintaining the ease of use that most other comprehensive tools lack.That said, it would be great to incorporate some of their features such as different scenarios, load patterns, particular series of pages, random, etc. It would be great to not have to have a dedicated resource to run the stress tests, it's also tricky to know if the local bandwidth can properly emulate x number of machines.