i have taken part with the many other to download the Windows 8 Consumer Preview, however the missing start button erks me everytime, and it's hard to open the charms on my tablet.
anyways, i made a small executable that simply launches metro, if you pin it to the bottom left of the taskbar, it makes a nice stand in for that missing start button.
you can hit the link bellow to try it for yourself
hope this helps someone
Windows 8 Missing Start Button Work-Around!