Maybe you should post a md5sum of your bitcoin tarball, if this can reassure you.
Here is mine, which I downloaded December, 13th :
67c0d4a5c7310a94ee1ed8b2effa22cb bitcoin-0.3.19-linux.tar.gz
And here is the sha256, in case you're paranoïd enough not to trust md5
:
59e9caf30db34e6a5a86569c07c34305b4c4eae4e3f9b7757aaecc02fba83583 bitcoin-0.3.19-linux.tar.gz