Psensor v0.6.2.12 has been released, it adds an option to restore the position and size of the main window.
For Ubuntu, ppa:jfi/psensor-unstable is going to be updated with this version, then ppa:jfi/psensor if no packaging issues are found.
v0.6.2.12 is now the last stable version of Psensor. For the list of new features since previous stable version (v0.6.1.10), you can consult the NEWS file.
I plan to upload this version into the Debian testing repository in coming weeks and hope that it will be « autosynced » to Ubuntu Precise (next Ubuntu LTS release).
As usual, you can download the source archive from: http://wpitchoune.net/psensor/files.