So you have installed Sharepoint Trial edition which usually expires after 180 days. After some days you might wonder at what date exactly your installation expires. I had trouble finding it too and posted my question in technet sharepoint forum. Eventually found the answer and posted that too in the thread. Find it in below thread. I believe this applies to Sharepoint 2010 also.
Here is a nice write up on Sharepoint vs Drupal. This is from microsoft blog so you might want to take this with a pinch of salt. But still it is the only blog in internet where someone is presenting the advantages of Sharepoint. Whichever blogs you might get by googling Sharepoint vs Drupal, they all speak about Drupal being best.
Updated: I recently came across this blog on Sharepoint 2010 vs WordPress. This is definitely nice read and can help decide which product to choose.