You may want to run SQL Profiler and find the queries using the most CPU time and optimize them. Try:

Events: "RPC:Completed" and "SQL:BatchCompleted"

Data Columns: Move "CPU" up into the "Groups"

Filters:...

leet:

When you say queueing, are you thinking MSMQ to temporarily store things so during really busy periods the queue fills up somewhat, then when things slow down abit the queue...