Mateusz Grotek wrote: 
Ben Coman pisze:
  
Mateusz Grotek wrote:
    
How to see the difference between two packages by using Monticello?
      
Do you mean two versions of the same package, or two different packages?

cheers -ben
    
Two versions of the same package
To compare versions A & B of a package...
1. In Monticello <Open> the repository
2. Select package version A
3. Click <History>
4. From the history, right-click on package version B
5. then click <view changes -> "package B">

If however package B is not in the history of package A, then I think you can only load package A, then select package B and click <Changes>

hope that is clear enough,
cheers -ben