If the comment is irrelevant and if you spam alot of blogs..then yeah...most likely it's blackhat. Otherwise if it's relevant and a good quality...
You said that you have alot of original content, but have a high bounce rate. Is there any misconceptions with your traffic source that could be...
Good internal link structure for SE navigation and also good internal links pointing to the web page, especially for those pages with a higer PR....
Just google the product that they are providing first to get an idea of initial competitors
Just try to build traffic through a few different methods. You can implement emails, talk on forums that are related to yours and blogging as...
Just keep on posting. Sometimes it happens when you make a change to a site. Whether it is as small as the tables that you did or something else...
Funny, but true explanation. And yes, they convert far better than generic short tails, however if optimised right, short tails can bring in...
Separate names with a comma.