The Scottish Parliament's e-petitions website is still not operational, more than four full days after it crashed. The Justice for Megrahi petition was opened for signature on 8 October 2010. The last date for signing (fixed, amongst other reasons, so that the petition could be dealt with before the Scottish Parliament elections) is 28 October. The website's failure has already deprived the petition of twenty per cent of the time allotted for signature.
Note, however, that you can sign the petition by SMS. Text the number 417 and your name to 07537 400395 (from outside the UK +44 7537 400395).