Question: what kinds of toalbars are there? 

Answer: Far too many.  You have to be carefull.  My Dell came packed with a toolbar that made windows internet explorer fail to launch. I wish I could tell you what that was so you can avoid it.  I try to stay clear from toolbars.  I have a collection of search engines in my Mozilla Firefox browser, but they don't take much space. Plus I can pretty much build my own toolbar with Firefox with links to all my favorite spots, like e-mails, myspace, netflix, etc.  It's convenient and you don't need to install any extraneous software to add it to your browser.
This question from the Yahoo Q&A forum is categorized in the topic: Science & Mathematics