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As I work a lot with templates I use GiJoes TemplateAdmin module.
And BlockAdmin for managing blocks.
They merged into AltSys.
I'm not shure how they work on new versions of xoops, so you need to check...
As JAV pointed xoopscare is very usefull module.
You may find some hacks also usefull, but that will make your job when upgrading much harder!