Tracing a career arc which has taken him from stand-up comic to actor, writer and film director, it's not too fanciful to describe Bobcat Goldthwait as an anarchic, indie, low budget version of Woody Allen. The 50-year-old New Yorker started out in the clubs of Boston before heading west to Hollywood in the 1980s, where he cultivated a shrill-voiced, nervy, confrontational comic persona to considerable success.

The fact that the latest in a long line of Dara O Briain DVDs is already on sale on Amazon is pretty impressive considering that he hasn’t recorded it yet. I know this because the second show of his four-night run at the Playhouse happened to be the one immediately before the gig being filmed for a timely pre-Christmas release. If it captures the warmth and verve of last night’s show it might even turn out to be one of those rare comedy DVDs worth buying.

The purple cow has taken up its summer residency on the South Bank in London before making the journey to the Edinburgh Fringe in August. As ever, the line-up of performers is extensive: last night comic Tom Allen performed his chat show with the help of a few comedy guests.

Before he started making regular appearances on BBC Two's Mock the Week, Stewart Francis was an accomplished comic of some years' standing on the circuit - and that experience shows in his extensive UK tour, Outstanding in His Field, where he proves to be a slick performer whose set is delivered with exquisite timing.

On a bitingly cold and snowy night in Leicester, Nathan Caton still manages to attract a big house for his show Get Rich or Die Cryin'. The hip young Londoner, in corncrow-and-dreads hairstyle and city slicker casual gear, is an immediately engaging presence on stage at the Firebug club, dissing his teated fruit-drink bottle as undermining any macho posturing he may be tempted to do.

There must be something in the air. Hot on the heels of Alexei Sayle returning to stand-up in the guise of an MC introducing young talent to a wider audience comes Frank Skinner doing the same. In truth, the latter started the trend two years ago with Credit Crunch Cabaret, and now his Frank Skinner and Friends is having a short West End season – in which he mixes mixes some scripted and riffed material with promoting a few lesser-known acts.

It has been 16 years since Alexei Sayle last performed as a stand-up, save the very occasional charity gig, so there was a proper sense of occasion at the Soho Theatre when he came on stage. The old lefty, brought up in a Stalinist household in Liverpool, was alternative comedy's biggest name back in the 1980s and the scourge of the Thatcher government, so how would his sneering, disdainful political material fare now?

Bubbles are emanating from Simon Munnery's head. They're streaming out of a huge, black stovepipe hat which he has cobbled together from cardboard and sticky tape. He has also slung an electric guitar over his shoulder as he sidles up to the mic to begin Hats Off to the 101ers, and Other Material. What does he look like? A cranky mishmash. Kids' entertainer or mad Victorian undertaker? Fortysomething geek or indie rocker?

In a year when there was precious little to laugh at economy-wise, some funny men and women were doing their best to keep our chuckle muscles in working order - although, strangely, you may think, few stand-ups were doing overtly political comedy - and the Edinburgh Fringe, normally a reliable source of laughs, was having a quiet year as lots of established comics stayed away and the next generation mostly hadn't yet found their voice.

What makes something funny? Why do comics stand on stage in front of strangers and try to make them laugh? Is any subject beyond a joke? What is the purpose of Alan Yentob? Those questions – OK, only the first three – were raised by Imagine's presenter in this, the first of a two-parter about the art of stand-up.