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Inevitable
Lily's perspective. Everyone insists that by refusing James she's just prolonging the inevitable. This story is filled with much action and drama, as it includes many incidents that occur in the first war. It's over 20 chapters, so make sure you have a few hours set aside to read it. - by Madelynn

Dates, Pranks and Marauders
Hilarious story! James and Lily go on their first date FINALLY, which would be perfect if James' best friend wasn't the mischeivious Sirius Black. - by Hilary and Jess

Not all who Maraud are Lost
Marauders at Hogwarts romance fic with tons of references to Lord of the Rings. It's long, but good if you want something different. - by jimithang

Confessions of a Redhead
Lily's diary entries throughout her seventh year. She's tired of being single, so she finally decides to date someone. It isn't Potter, and he doeasn't seem very happy about that. The thing is...deep down neither is she. - by The Potter Identity

The links from HarryPotterFanFiction.com don't work for some reason, so you'll have to go to the site and type in the title under "search" yourself. Here's a list of some great ones:

Captivated
Lily broke up with James and is now engaged to someone else, but when she sees James again will their old relationship rekindle? - by velvet

Switching with Sirius
Hahaha! Sirius and Lily switch places! rofl Seeing how James treats treats his friends first-hand makes Lily realise she may have misjudged him. - by velvet

Can't Take My Eyes Off Of You
Tale of the friendship of the Marauders and love of Lily and James. One of the best portrayel of the Marauders' friendship I have ever read. - by vivianpotter

Lost Letters
Harry finds letters written from James to Lily that let him look into his parents memories almost the same way a pensieve does. - by TomFoolery

Anything by Secret Lily is fantastic and more than worth a reading.
Her two best:

Potter's Charm- An immeasurably funny fic that first got me into the couple. An eternal favorite of mine.

Lily and James: Their Story of Love- My undisputed favorite. It straight out shows how the famous couple came to be, and introduces a cast of original characters that you get every bit as attached to as you do to J.K.R.'s. It's funny, tragic, dramatic, and it has a plot! Careful, though, the sequel is utterly heartbreaking.