Quilt Studio is hosting a series of posts about fusible web, how we use it, what brands we like, etc. I don't use fusible web too much, but I will comment on my experience.
Brands: I've tried Wonder Under, Steam-a-Seam, Steam-a-Seam Lite, Misty Fuse, but my favorite is one called Trans Web. Unfortunately I haven't been able to find this at my local JoAnn's so will have to look on line when my current supply runs out. My biggest gripe about fusibles is that the paper sometimes doesn't release after the first fuse. I have most success by scoring the paper with a pin and pulling from the score, not pulling away a corner. I like Trans Web best because it releases better than the others. There is a new product made by Pellon called Wonder Under Web, which is just what it says, web only, no paper. So you would have to use parchment paper or a teflon press cloth with it. I haven't tried it yet, but it sounds promising.
Here's a link to an old post where I talked about fusible brands in a bit more detail.
Fuse the Shape, Fuse the Whole Fabric: I've done both ways. Usually I trace the shape on the paper, fuse, cut out the shape, score the paper and peel it away before the final fusing. But I have cut free hand from a pre-fused piece of fabric for something small and casual, like a post card. That is easier, but you have to be a good free-hand cutter, obviously. You can also trace around a pattern directly on the fusible-backed fabric. This works well for a simple shape.
Finish the Edges Usually. Again, not for a postcard.
How to Clean the Iron Dritz Iron-Off. Works like a charm. The ironing board cover is another matter. I throw those away regularly. :)
Cruise on over to Quilt Studio, read the other links, and add your own.