Others have listed the episodes and their descriptions, so I'll just add some food for thought.
Watching the whole first series, in sequential order, is a real eye-opener. The writing was fantastic and the characters delightfull, but what was truly great about this show was the way it just drew the viewers into these people's lives, the way it dealt with pregnancy scares, criminal backgrounds, menopause, meeting the in-laws, spicing up one's sex life, career changes, personal politics, alcoholism, fear of commitment, identity crisis, jealousy, fear of change, and marriage--all in the first season, and all with a sense of levity that is lacking in much of today's popular television! Watching these 3 DVD's, I laughed until I cried.
Also touching are the commentaries done by the actors that play Dharma, Abbey, and Larry. They truly loved their time working on the series, had a great fondness for their fellow actors, felt at home in the sets (they point out details about the O'Neil/Finkelstein kitchen, and the Finkelstein/Montgomery living room that you probably never noticed, and tell amusing stories about props), and are always willing to laugh at themselves ("Abby's" tales of her ever-changing hair and her real-life husband, who was the inspiration for Larry, and how he beat up Goofy at Disney World, are well worth listening to the commentaries...also not to be missed are "Dharma's" descriptions of eyebrow do's and don'ts, and "Larry's" tips on where to buy hippy clothes).
My favorite moments in this season of the series include: watching Penn (of Penn & Teller) play a man who thinks he is a housecat, seeing two young women trying to cook their first Thanksgiving dinner manage to lose a live lobster, watching Greg attempt yoga, watching Laurie Metcalf (of Roseanne) play a psychotic self-defense instructor who invades Dharma's nightmares, and seeing a woman with gothic make-up, dreds, and black fishnets walk down the aisle in a pink bridesmaid's dress, followed by a rather tall drag-queen on the arm of a short groomsman.