The phrase "already check out" is not correct in standard written English.
It may be intended to convey that something has been examined or reviewed, but the structure is awkward.
Example: "I have already checked out the new restaurant in town."
Alternatives: "already reviewed" or "already examined".
Finally, if you haven't already, check out 007 star Daniel Craig's video for International Women's Day – it really gets its point across.
If you haven't done so already, check out Path of Exile, which (along with the excellent Torchlight 2 and very disappointing Realms of Ancient War) is on my top-ten upcoming action-RPG list.
If you haven't already, check out Carroll Bogert's essay on human rights and the media in the Human Rights Watch World Report 2011.
And if that's not enough fun already, check out Hermès' Silk Knots app too, which is themed around— you guessed it— showing users how to perfect wearing the brand's trademark scarves.
Indeed, if you haven't already, check out Alexandra Robbins' book Geeks Shall Inherit the Earth, where she confirms that high flying companies prefer quirky thinkers over the conventional.
You find a lot of stand-ups on Twitter these days, using the deliberately constrictive medium of 140 characters to hone their one-liners (if you don't follow them already, check out the feeds of Gary Delaney and Peter Serafinowicz for a ready supply of priceless stuff).
A magazine rack, computers and Wi-Fi, plus a shower room for guests who have already checked out, complete the winning formula.
As we laced up our boots at the trailhead, with Betsy already checking out the smells of the forest, we were told by a ranger to look out for bears, which had been bothering picnickers in the area.
Chief among them are hotel and cruise-line executives who see a huge pent-up demand for travel to this long-off-limits country and are already checking out sites where they can build new hotels or dock their ships.
Map markers are color-coded for at-a-glance info: Green means the property was added to the database in the last 24 hours, gray means you've already checked out the details, and black means the listing is older but you haven't checked it out.
