Although an alignment could be significant, its not really part of this HDDesign.
Use a planetarium program to position yourself over the Sun's North pole, then watch as Mercury and the Earth orbit. I did that myself, and by using a straightedge to determine when the Sun, Mercury, and Earth were all in a straight line, came up with the following dates:
* 26 Nov 2008
* 28 Jan 2009 (55 days later)
* 20 March 2009 (69 days later)
* 18 May 2009 (49 days later)
Now I would have expected the number of days between conjunctions to be more even. The fact they are not means either I don't understand orbital mechanics (I don't!) or I was too lax in deciding just what constituted a straight line when I had my ruler against the screen.
Having said all that, it's simply astrological nonsense to believe that anything Mercury, Venus, or Mars do as they go around the Sun has any effect at all on events on Earth.