I found an interesting load generation tool on IIS.net defiantly worth a look
Features
- HTTP 1.0 and HTTP 1.1 capable
- Supports IPv6
- Multithreaded Support
- Supports generating stress from multiple machines
- Extensible through C plug-in DLLs
- Supports Performance Counter integration
- Measures throughput and response time
- Supports SSL requests
- NTLM Authentication request support
- Easily supports testing thousand of concurrent users
Benefits
- Very light weight (low hardware requirements)
- Extensible to handle any aspect of the HTTP request or response
- Allows remote collection of perfmon data and registry
Down Load