Resurrecting this topic to include my favorite lounges:
- Renaissance Chicago (food + view + open on weekends)
- Renaissance Chancery Court (food + service + open on weekends)
- Renaissance Brussels (food + open floor plan + check-out service)
- Marriott Downtown San Francisco (food + view)

Marriott West Richmond Virginia
Renaissance Chicago Downtown
Marriott Trumbull, CT (they actually have a chef doing eggs cooked to order some mornings)
Renaissance Austin
Marriott London Kensington
Renaissance LAX

JW Marriott Denver

Marriott Baltimore Waterfront

I agree, the view is great--the lounge is huge!

I'm also fond of the Richmond West lounge where I spent 9/11.

Best Concierge Lounge?
 

Here's my choices:
JW Marriott- Hong Kong (fantastic)
San Francisco Marriott (great view)
Ontario Airport Marriott (amazing food and open bar)
Anaheim Marriott (open weekends and friendly staff)
San Diego Marriott & Marina (great view and helpful staff)

Renaissance Kowloon - Excellent service, and great food.

I've only been to a couple dozen, but some that stand out:

LAX Renn
San Diego Marriott and Marina
Marriott Baltimore

I stayed at the Ren in Chicago over a weekend about four months ago and although the lounge was open, I was told that it was normally closed but open only because of a major convention was in town.

If you like the SF Marriott view then you would also like lounge at the Ren Parc 55 a couple of blocks away.

I agree! The DFW Airport South has a great lounge. Good food and great service. ^

the view
 

The view at the San Juan Puerto Rico Mariott Lounge at night is magnificent

JW Marriott Hong Kong.

Breakfast 7 days a week. 3 hot entries daily including a couple dim sum items. Fresh squeezed OJ.

Afternoon tea daily.

Complimentary cocktails every evening, including Friday and Saturday. Great selections of finger food.

Desserts nightly until midnight.

A conference room in the lounge. Use it up to 2 hours without charge.

Top mentions so far
 

Looks like the most mentions so far have been
- JW Marriott Hong Kong (service + view + food + open on weekends)
- San Francisco Marriott (view + food)

...keep 'em coming!

Zurich Marriott has great food/free wifi and really nice help

DFW South has great people and a nice selection of foods

Sydney is my newest number 1. It is open 7 days and operates from 6 a.m. to midnight. Great breakfast from 7 to 11 a.m. with three hot entrees; fairly lavish spread from 5:30 to 7:30 p.m.; dessert with dessert wines from 8 to 10 p.m. Complimentary beer, wine, and cocktails from 5:30 to 9:30 p.m. Coffee, tea, and soft drinks are always available during the day and late evening. Also has great views from the 30th floor of either the Bridge or the Opera House. But what makes it really special is the attentive and personable staff. :)