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Before you run out and update to Leopard, pick up AppFresh, a free program that will let you know which of your applications are as up-to-date as possible. Since it’s only compatible with Tiger for the moment, don’t update to Leopard and then run it. Update your apps before you put 10.5 onto your system.
AppFresh runs through all your applications (and widgets, plug-ins, preference panes) and let’s you know whether you have the latest version installed. It can take a little while for AppFresh to run through all your apps and stuff, but be patient. Here is what you’ll see if a program needs updating:

Here, it’s letting me know there is a newer version available to download.
It can also let you know the last time you used a program:

So you can think about deleting it if you haven’t used it in a while. (try using App Zapper to delete old apps)
It’s a nice little free program, albeit with no built-in help; you will need to visit the website for help. But, it’s free and can help as you need to update those programs for Leopard.


