Clicked on a link on Yahoo news about the Dalai Lama. Avast triggered, file was not downloaded. Went back to look and that link is gone now. Here is the content of the Avast log, edited a bit:
1/26/2010 6:40:13 AM SYSTEM 1640 Sign of "JS:Pdfka-TW [Expl]" has been found in "http : // ditrnbibarsp dot com /kav /kav1.exe /oHdfbc1b88V0100f070006Rd9f71314102T94e2cf1f201l0409K57868056317" file.
Thanks for watching my back. :-)