In computing, a preview may be where output of a particular document, page, film, etc. is displayed before it is produced in its final form. In the case of printed material this is known as a print preview.
Many websites and online forums allow users to preview their content before submitting it. This is especially important in sites with complex markup (not WYSIWYG), where it serves as second chance to catch spelling errors and similar issues.
In performing arts, a preview can be a performances of a film, play or musical that may take place before the official opening night, usually for the benefit of critics.
500allaboutgames.co.uk: Preview - Preview by Dave Wickham. If it is as good as this beta then you should get it - even if you aren't a fan of strategy games normally. Also includes screenshots.
Gamer's Hell - Preview by EinKil, [7.5/10]. A great game to introduce players in RTS games, an easy ride for experieced players who wants fast entertainment.
GameSpy.com - Review by Peter Suciu. Celtic Kings isn't the most innovative game, but there haven't been any decent Roman-themed real-time strategy epics in a very long time. Also contains screenshots.
404The Adrenaline Vault: Preview - Preview by Gavin Carter. If the gameplay is as good throughout the game, Haemimont could have a real winner on its hands. Also contains screenshots, system requirements, and links.