Recently, CBS announced that episodes from all four seasons of Enterprise are now available at CBS.com! I encourage everyone to check it out (you can find it here), if for no reason other than there is nowhere else to watch Star Trek anymore. And it will only be for a limited time. Now that it has been several years since its cancellation, you might see something in it that you never saw before.
For a list of suggestions, visit my Top 10 Enterprise episodes page here (my runner-up episodes will appear shortly). Now for TNG, DS9, and VOY!