I'd like to start by saying that I'm still only a beginner with Inkscape. Yet despite of my lack of knowledge about vector graphic editors, and vector graphics in general, Inkscape is still a convenient and simple way to create professional, impressive looking logos and buttons with little technical expertise or knowledge of graphics editing software. The simplest way to do this is to use the text tool to type out what you want, choose a nice font, and then play around with the various filters until you get the effect you want.
One filter is nice, but multiple filters can make something even more impressive looking. The logo on my blog is a result of doing just that. The rainbow-swirled paint splash is actually the product of a square with a gradient and several different filters stacked on top of each other. You'd never know by looking at it that it started as a square (a gray square even, if I remember right). Working with text is pretty simple with Inkscape and you don't need to rasterize it to use the filters.
Filters are in abundance. Options include the very basic (lighten, darken, sharpen, blur, etc), textures, colorize, "non-realistic 3D shaders," overlays, materials, bevels, and more. Resizing and rotating individual components is a breeze, but cropping them can be a bit confusing. Cropping in Inkscape is actually called "clipping" and it doesn't function exactly the same as most cropping tools. I had to conduct a Google search to figure it out, and even then I only found one or two sites that explained it in a way that made sense. I have re-posted it on my blog for your convenience.
You also have to watch your actual file sizes in Inkscape. If you work without setting the canvas size and go mostly freeform, you can end up with a very large image file without realizing it. If you've done this and try to zoom in, Inkscape's performance reduces significantly, depending on your computer's technical specs. It corrects itself well, but you may have to give it awhile.
The most advanced part of Inkscape is working with paths and nodes. Admittedly I am not experienced with paths and nodes yet. I have used them a little in experimentation, but for the most part I can't give a good review on the usage of paths and nodes with Inkscape. Flattening layers is also something that I imagine is possible, but I have yet to figure it out exactly. That's where the "Advanced" recommendation comes in. If you are comfortable using Adobe Illustrator, figuring out paths and nodes in Inkscape should be simple. I never got comfortable enough with Adobe Illustrator to have a definite opinion on the paths and nodes functions in Inkscape (and have not had a reason to use them much in Inkscape, either).
Experience Level Required: Intermediate to Advanced
Pros: Relatively easy to use, variety of in-depth editing features, supports a variety of input and output types including support for Adobe Illustrator.eps files, filters make professional looking edits with ease, many features are easily tweaked to accommodate your particular needs, many options for exporting bitmaps.
Cons: Some features are more technical than novices may be comfortable with (prior experience with Adobe Illustrator would likely be helpful), resource intensive program, viewing files at full size has to be done carefully to avoid locking up the program, cropping took some time to figure out.
Click here to download the software ==> Inkscape