My wife and I are here three or four times a month at least because DL is our favorite breakfast place in Calgary. We've tried everything on the menu, but the Hillhurst Sammy and the stuffed french toast are our favorites. For lunch/dinner, I like the pork burger with the sesame mandarin salad as a side.
All of the food is excellent, just beware that this is a popular place so there is often a line-up to get in on weekends (there are only ten two-seater-tables in the restaurant, about four two seater tables outside - weather permitting).
Dairy Lane is now open evenings seven days a week so evenings might be easier to get in. The burgers are always excellent and there are daily specials which are also delicious.
If you are near Bridgeland, you can try the sister restaurant "Blue Star Diner".