Honestly if you know how to use the templates in dreamweaver it can be very helpful. If you dont you get books that show you how everything in dreamweaver works or you can also watch video tutorials on how to use dreamweaver. you can find tutorials everywhere. just google it.
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Honestly speaking I use wordpress templates for my blog. But I am very much interested for DreamWeaver Templates. These DW templates are so cute and nice. Video tutorial of course is the best option to learn DreamWeaver template making.
I've used Dreamweaver templtes for years - (going back to 2001/2002 I think). Makes life VERY easy when you're just swapping out certain sections of a template. The extra coding that's added is minimal and shouldn't affect loading time.