Some good news for commuters in Thonburi is that the skytrain extension is near completion. At the moment, the Silom Line only goes as far as BTS Wongwian Yai (S8). According to Bangkok Governor Sukhumbhand, two more stations will open on 5 December 2012. These are BTS Pho Nimit (S9) and BTS Talad Plu (S10). Passengers will be able to use this new section for free until 15 May 2013. In addition, BTS Wuttakat (S11) and BTS Bang Wa (S12) are expected to open on 12 August 2013. Click here for my map of the skytrain extensions.
UPDATE (17 January 2013): BTS Pho Nimit opened last week. BTS Talad Plu is due to open in February 2013.