If you're a T-Mobile customer with an HTC Desire, then your Android 2.2 update time has come.
Go to Settings > About Phone > System Software Updates > Check Now, and you should get a message to let you know that Android 2.2 is ready to download.
It's a 90.93MB update so you might want to do it over your Wi-Fi connection.
Wondering about Android 2.2 features and whether you should bother? For starters, it's faster. And it has better HTML 5 support. And it allows you to use your phone as Wi-Fi hotspot.
To help you get up to speed with your new OS, check out our 20 handy Android 2.2 tips and tricks.