You can just host 1 the database without any other services.
Quick step guide:
1 - Register for Windows Azure (free trial or pay as you go)
2- In the Windows Azure Management Portal, go to the Database and create a Server (you need to open the firewall for some IP addresses, all IP are blocked by default)
3 - Create the database
4 - Use SQL Azure Management Portal to manage the database
Pricing as refered before:
| Database Size |
Price Per Database Per Month |
| 0 to 100 MB |
Flat $4.995 |
| Greater than 100 MB to 1 GB |
Flat $9.99 |
Take a look at
http://www.windowsazure.com/en-us/home/features/sql-azure/
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