SQL Server 2000 Service Pack 4.0 has been released. This is a recommended download as it fixes several previous bugs. Note though you might not want to install this on your server yet, from Microsoft:
"Microsoft has found an issue with the final build of SP4 that impacts customers who run SQL Server with AWE support enabled. This issue only impacts machines with more than 2GB of memory where AWE has been explicitly enabled. Customers with this configuration should not install SP4. Microsoft is currently working on the problem and will issue an update soon."
This should be a safe install for developers though.