Santa Barbara has a great italian place called ca d'ario - at least i like it a lot, mores than the other trendy/popular italian places
If you want a good burger, hit the santa barbara brewing companies, good local beers (i'm told, i don't drink) great burgers, heavnly garlic rosemary french fries and college girl waitresses who will flirt with you for extra tips.
Football Sunday, Sharkeez for breakfast, nice hawiian bread french toast.
There's no good deli/bagel place in santa barbara and it's kind of sad, i prefer the hambruger habit, fatburger (and when it was open RGs) to in and out if i'm going 'affordable' versus brewing company which is more of a bar/rest than cheap eats
Mexican Food - Super Cucuas, two local locations, great food, good prices, rudys is good (and closer to work) but cucas is better.
No real diners, but there is a place called the mesa cafe that comes close.
Sushi - don't eat a lot - but there's a place downtown called piranaha i think that every one loves, but i think that's more trendy than anything else...i can't say for sure, but i know it ain't cheap
Pizza, Taffys is the best locally, giovannis is ok, depending on which one you go to
If you come to SB and want a place on the water, there are dozens, from Longboards on top of a 'real' restaurant whose name I forget to moby dicks that are out on a pier,
The original SAMBOs is still open in santa barbara, and people rave by it for brekfast, but i've been there and was unimpressed, ditto for cajun kitchen, long wait for not so good food...
Nice burger place called the shoreline cafe, you can literally order and sit on the beach.
Eating by the beach is a given in santa barbara, pretty easy :0