I'm +1 for BleachBit, plus it offers the ability to preview files before deletion, and specify custom folders to delete (like Steam's httpcache folder)
For removing old kernels, I use this one command:
As you upgrade your kernel, the old ones accumulate a bit of space in /boot.
To remove them and regain some space, here's a handy command:
sudo apt-get remove --purge $(dpkg -l 'linux-image-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d')
Does the trick all the time, especially for a dedicated but small /boot partition.
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