A really neat product, I'm especially interested in how you came up with this list of performance counters, and if the list is considered proprietary:

Machine: processor time

Avg. CPU queue length

Machine: memory used

Memory pages/sec

Network utilization

Disk used

Disk avg. read time

Disk avg. write time

Disk transfers/sec

Avg. disk queue length

User connections

SQL Server: processor time

SQL Server: total memory

SQL Server: target memory

Batch requests/sec

Compilations/sec

Compilations/batch

Recompilations/sec

Buffer cache hit ratio

Buffer free pages

Buffer page life expectancy

Full scans/sec

Page splits/sec

Page splits/batch request

Latch wait time

Lock timeouts/sec

Lock waits/sec

Avg. lock wait time

Transactions/sec

Active transactions

Total size

Data size

Log size

Log space used

Log bytes flushed/sec

Log flushes/sec

Log flush waits/sec

Thanks for the wonderful detail about each counter. It would be nice to see it posted on this website.