Few playwrights have been so successful at moulding our view of a nation as Athol Fugard. It’s impossible to think of South Africa, especially during the apartheid years, without thinking of his Sizwe Bansi is Dead, The Island or Statements after an Arrest under the Immorality Act. Since the end of the old regime in 1994, the moral fuel that powered his plays may have evaporated, but this new work, one of nine premiered by the 78-year-old author in the past 15 years, shows that his feeling for stagecraft and his concern for human dignity remain undiminished.

If any play of the past two decades deserves the label legendary it must be Sarah Kane’s debut, which was condemned as “this disgusting feast of filth” on its arrival in 1995, but is now firmly ensconced in the canon of contemporary playwriting. Although the shock of its original production, which in retrospect simply heralded the appearance of a distinctive new voice, has led audiences to expect a similarly frightful experience every time it is revived, subsequent productions have emphasised the play’s poetry and its relevance.

Let's face it, the rom-com has an image problem. Too often, this genre is tainted by either sugar-sweet sentimentality or crashing cliché, or both. Often, there’s something more than a little oppressive about the whole idea of romance, as if love’s natural idealism is too weak to withstand a cold dose of reality. But there are exceptions. And this show is one of them. It’s great to be able to welcome D C Jackson’s new play, which he calls a “non-rom-com”, and which arrives in London having first enjoyed a successful outing at the Edinburgh Festival in August.

Verbatim drama, long established in theatre, has rarely been used in film. But director Clio Barnard uses the device to magnificent, and sometimes deliberately disjointing, effect in The Arbor, to tell the story of Bradford playwright Andrea Dunbar, who wrote The Arbor and Rita, Sue and Bob Too (made into a film in 1986) before she died at the age of 29 in 1990.

When, earlier this year, Edward Hall took the reins at the Hampstead Theatre, some eyebrows were raised. It’s meant to be a new-writing theatre and Hall has had much more experience directing Shakespeare than in tackling new plays. On the other hand, this venue needed a clean sweep and Hall is certainly able to wield a new broom vigorously. His first show, Shelagh Stephenson’s thrilling play about the disappearance of a gap-year student, opened last night — and it’s an excellent debut.

The news last week that Michael Grandage will step down next year as artistic director of the Donmar Warehouse feels like one of those moments when an era ends. His ability to programme not only the small Donmar but also to bring excellent productions to the West End — notably Jude Law in Hamlet — is exemplified in the current mini-season at the Trafalgar Studios, which opened last night with American playwright Beau Willimon’s new play about the New Orleans floods of 2005.

Adultery has had a good press recently. Websites such as meet-to-cheat.com, illicitencounters.com and lovinglinks.co.uk have been in the news, and statistics suggest that more of us are being unfaithful than ever before. But although adultery is a staple of farce and mainstream drama, there are few plays that deal with the subject with quite the unsettling ambiguity and disturbing depth that characterise Martin Crimp’s modernistic play, first performed in 2000 and now beautifully revived by the up-and-coming Amelia Nicholson.

You can see the appeal of being a slacker. You don’t work, you just sit around like a cool dude and shoot the breeze; you smoke, you drink, you take drugs, er, lots of drugs. You can call people “man”. Hell, you don’t even need to wear your sneakers all day - just kick them off and go barefoot. Only one problem: emotional commitment is a big no, no. American playwright Annie Baker’s new play, which opened at the Bush Theatre last night, takes a long calm look at slackerdom’s highs and lows.

Middle-class family angst is this season’s theme at the Royal Court Theatre. And, in his new play about sex and intimacy, which opened last night, playwright Nick Payne puts the lust in Wanderlust and creates a contemporary tale of wandering hands and wandering affections. We are in a nice suburban part of England, and the mix of pain and pleasure will be all too familiar to most audiences, whether they are teenagers who can squirm at the antics of the youngsters, or middle-aged couples who might find the more mature characters shockingly recognisable.

What is with the National and history plays? On the large stages of this theatre, the main fare is historical accounts of contemporary problems. Maybe the programmers here imagine that their audiences, like T S Eliot’s humankind, “can’t bear very much reality”. History always has a nostalgic glow. So instead of commissioning a new play about the current war in Afghanistan, the flagship venue is staging American playwright J T Rogers’s drama about the Soviet Union’s 1980s occupation and the covert war, waged by the CIA, to stop the reds by any means necessary.