Heath Ledger's death has boosted sales and interest in the late actor's films.

As often happens after the death of a famous actor or musician, many have sought to revisit or simply discover his work.

Three of Ledger's films featured among the 25 best-selling DVDs on Amazon.com on Friday afternoon.

At the time of his death, Ledger was in the midst of shooting The Imaginarium of Dr Parnassus, directed by British filmmaker Terry Gilliam. The film recently completed shooting scenes in London and was soon to resume production in Vancouver, British Columbia. Producers have not said whether the film will continue or not.

In the film, Ledger was to co-star with Christopher Plummer, Lily Cole and Tom Waits. Options open to producers - depending upon how many scenes Ledger had left to shoot - include recasting (and thus refilming) his part, finishing it with the help of a body double (as was done after Brandon Lee died while making 1994's The Crow) or simply binning production.

In an interview last month with Variety, Gilliam told the trade paper: "Heath is extraordinary. He's just so good, and he's going to be a film director. He's watching everything, and he's going to be a much better director than I will ever be."

Amazon customers have mainly been purchasing copies of Ledger's 1999 comedy 10 Things I Hate About You and his 2001 period action flick A Knight's Tale. After those films, Ledger pursued more dramatic, challenging roles, with 2005's Brokeback Mountain - the third most popular of his DVDs on Amazon - being roundly considered his finest achievement.

The 28-year-old Australia native died on Tuesday in a Manhattan apartment. Toxicology tests to determine the cause of death will not be completed for at least a week.

Ledger's latest film to be released, the multi-persona Bob Dylan film I'm Not There, has mostly completed its theatrical run. It played in only 61 US cinemas last weekend.

The impact of Ledger's death on his last completed project, The Dark Knight, remains to be seen. The latest instalment in the Batman series, Ledger plays the Joker, and his dark, twisted take on the villain had been a focal point in the film's advance promotion.

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