You can hold ⌥ (Option) to make windows resize symmetrically, from the center. It even works when resizing from any corner in Lion. Update: You can also hold ⇧ (Shift) to resize a window proportionally.

As far as I can tell this is brand new in Lion, the first version of OS X that allowed resizing windows from any side.

Thanks to Kelly and Sören Nils Kuklau for help with this post.

Support Finer Things in Tech on Patreon
You May Also Like

💻 Mail: Open messages in Split View when in full screen

When in full screen, Mail for Mac has an option to open messages and drafts in a separate Split View. It maximizes your full screen mail triage real estate.

A hope for an iCloud announcement next week

This might be a stretch, but I hope that recent iCloud hiccups mean something for next week’s event.