Quick script to get all the databases on a server, then output to a CSV file.

In this example, all I needed was the database name and its size.

[System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO') | out-null
$s = New-Object ('Microsoft.SqlServer.Management.Smo.Server') "YourSQLServer"
$dbs=$s.Databases
$dbs | SELECT Name, Size | Export-Csv c:\test.txt

Other properties:

$dbs | SELECT Name, Collation, CompatibilityLevel, AutoShrink, RecoveryModel, Size, SpaceAvailable

Credit for the base script:
Edwin M Sarmiento