Justin Gatlin sprints to his second gold of the Worlds as he takes the 200m from Wallace Spearmon and John Capel.
Michelle Perry takes 100m hurdles gold as Olympic champion Joanna Hayes runs straight through the last hurdle.
Holland's Rens Blom wins a shock pole vault gold after clearing 5.80m, while Walter Davis takes the triple jump title from Cuba's Yoandri Betanzos.
Five-time champion Allen Johnson cruises into the final of 110m hurdles by winning his semi-final in style.
DAY SIX DETAILS
Men's 5,000m heats
Isaac Kipromo Songok wins first of the men's 5,000m heats, with world 10,000m champion Kenenisa Bekele's brother Tariku in second place.
Ethiopia's Sihine Sileshi takes the place of 10,000m Olympic and world champion Kenenisa in heat two and qualifies comfortably in third, behind Kenya's Eliud Kipchoge and Australia's Craig Mottram.
Bekele, who won 5,000m bronze at the Paris World Championships two years ago, has decided not to double up after his efforts over the longer distance earlier in the week.
Men's pole vault final
Dutchman Rens Blom edges American Brad Walker for gold after clearing 5.80m as the pre-competition favourites fail to cope with the weather.
In windy conditions, Blom comes through to claim the first global track and field gold ever for a Dutch male.
No-one else in the field can match them, with Russian Pavel Gerasimov having to settle for the bronze medal.
Women's 200m semi-finals
France's Christine Arron runs a brilliant 22.45 seconds to win the first semi-final, despite wet and windy conditions in Helsinki.
USA's teenage sensation Allyson Felix wins the second semi in 22.90m despite a headwind of four metres per second.
Begium's Kim Gevaert also looks impressive behind Felix, but Jamaica's Veronica Campbell can only make third and will not get a good lane draw in the final.
Women's 400m hurdles semi-finals
Russia's Yuliya Pechonkina, red-hot favourite for gold, stutters over the first hurdle but recovers to win the third semi-final in 53.67 secs from Lashinda Demus.
American veteran Sandra Glover dominates the second semi, winning it in 54.16secs.
Britain's Nicola Sanders goes out after finishing sixth but runs a brave race, going out hard over the first 300m despite a tough inside draw and only tiring on the last 100m.
But later she is disqualified for an as-yet unspecified offence.
China's Xiaoxiao Huang edges out Poland's Anna Jesien as both qualify from the first semi.
Men's triple jump final
America's Walter Davis leads early on with 17. 22m, but Leevan Sands of the Bahamas takes over at the top with 17.39m.
But Davis then responds with 17.57m to take his first world title.
Cuba's Yoandri Betanzos takes second with 17.42m while Romania's Marian Oprea snatches a last-gasp gold with 17.40m.
Olympic and world champion Swede Christian Olsson is unable to defend his title because of injury.
And there is no British interest following Nathan Douglas' unexpected failure to progress in Wednesday's qualifying.
Men's 800m heats
Britain's James McIlroy runs an excellent race to qualify in second place from his heat behind 1500m champion Rashid Ramzi.
McIlroy battles hard down the back straight to stay in a good position and kicks on down the last 100m to hold off a strong field.
Olympic champion Yuriy Borzakovskiy wins the third heat from William Yiampoy and Djabir Said-Guerni.
France's Mehdi Baala and Wilfred Bungei qualify from the second heat.
But 2001 champion Andre Bucher from Switzerland is eliminated after finishing fourth in heat five.
Women's 100m hurdles final
USA's Michelle Perry takes gold as Olympic champion Joanna Hayes runs straight through the last hurdle.
Jamaica's Delloreen Ennis-London takes silver and Jamaica's Brigitte Foster-Hylton bronze, but Hayes finishes last and collapses in tears.
Defending champion Perdita Felicien of Canada failed to make it through Wednesday's semi-finals.
Men's 110m hurdles semi-finals
Hurdling great Allen Johnson continues his bid to capture a fifth world title by cruising into the final.
The American wins heat three in style.
Terence Trammel runs a super-smooth race to win the second semi-final from China's Olympic champion Liu Xiang.
Men's 200m final
Newly-crowned 100m world champion Justin Gatlin underlines his reputation as the greatest sprinter in the world as he adds the 200m gold to his fast-growing sprint medal collection.
Gatlin was the only one of the four Americans to run near his best as pre-race favourite Tyson Gay collapsed under the pressure and tied up in fourth.
Wallace Spearmon took silver with reigning champion John Capel dipping on the line for bronze.
Jamaica's teenage prodigy Usain Bolt pulled up in lane one when he realised his medal chance had gone.
Germany's Franka Dietzsch takes gold again, six years after her last world title, with 66.56m.
Russia's Natalya Sadova takes silver with the Czech Republic's Vera Pospisilova-Cechlova in bronze.
Men's wheelchair javelin final
Canada's Jacques Martin takes gold with a throw of 24.97 metres.
Home-town favourite Markku Niinimaki cannot quite overhaul him despite the roars of the crowd, and takes silver with 23.82m.
Gerasimos Vrionis of Greece took bronze with 16.75m.