Tabs are okay, but dangerous. If you do much revision or move to many different computer labs, your tabs are likely to wander over the page leaving ugly blank spaces in the middle of your text. The only rationale place to use a tab is on a line that appears next to a major head. Here's an example, the arrow indicates a tab. Tables have the advantage of translating nicely into html pages.
Bullets are more effective than dashes or asterisks in lists.
If your resume runs more than one page, always set up a header with at least your name and the page number. Learn how to use paragraph borders.