Better than just links, these are people I know personnally to be truly professional and reliable. 

Culinary friends

Rosa Jackson : cooking classes and market tours in Nice, customized gourmet tour information, food blog, all wonderful

Ô Château : Rightly popular Ô Château offers the best wine tastings in Paris. In English.

Lacanche : cooking ranges, entirely customized to fit your needs and choices (gas, electricity, induction), offering an amazing range of colors, enameled, made in Burgundy

Culinaryloft : New York (Soho) taste-full event space, atmospheric

And of course, for private or corporate events, my own place can switch to Le Salon Culinaire

Best Friend in Paris : Donna is an independant, truly knowledgeable friend, she organizes your activities in Paris efficiently and smoothly.

Short term rentals with great locations and impeccable service

Haven in Paris: luxury vacation rentals in Paris, Provence and Tuscany

Paris Perfect : centrally located, stunning Eiffel Tower views

Cultural tours

Paris Muse : private museum tours by art historians, now in its tenth year

Paris Private Guides : a broad selection of private tours, with driving option (wheelchairs welcome)

Les Promenades de Caroline : the best way to learn to speak French.  Caroline is a charming and experienced teacher with an innovative approach. 

and my selection of blogs with real substance

David Lebovitz : the most popular anglo blog on food and life in Paris, where David lives

Hipparis : very informative, and hip indeed, by the team from Haven in Paris

Dorie Greenspan : cookbook author,  accomplished pastry chef, Dorie fills the transatlantic gap

Rosa Jackson : her edible adventures are worth following

My Kugelhopf : Talented Kerrin Rousset, a New Yorker, married to a frenchman, living in Zurich reports on food and her travels through Europe

Ivy Paris News : this monthly newsletter reviews interesting parisian events in the vast world of art

Chic Shopping Paris : secret adresses, shopping tips, personal guides

Spectacularly Delicious : A tasteful food blog from New York