There's an very lengthy article about him up at the ABC. The best part of it, I think, is it describes his revival in influence, after the somewhat silly cultural milieu of the 1960's:
Intellectual historians have noted that the cultural trends of this turbulent period reflected an assumption that the prevailing cultural trends represented permanent changes in western culture. Tom Wolfe's essay "The Great Relearning" (1987) captures the Promethean aspirations of this age, in which the past would be discarded as an encumbrance, and the future reconstructed from ground zero. Yet historians such as Adrian Hastings have suggested that this period merely witnessed a temporary change of cultural mood, which some were unwise enough to treat as a fixed and lasting change in the condition of humanity. Hastings remarked that the "dominant theological mood of that time in its hasty, slack, rather collective sweep reminds one a little painfully of a flight of lemmings," propelled forward by "a sheer surge of feeling that in the modern world God, religion, the transcendent, any reliability in the gospels, anything which had formed part of the old 'supernatualist' system, had suddenly become absurd." For Hastings, it was as if the bright new ideas of the 1960s were doomed to implode, incapable of sustaining serious reflection on the deeper questions of life.The rest of the essay is good too: Rowan Williams has written very favourably of aspects of Lewis too. (In some very convoluted language, I expect.)
He seems to have been right. In the 1970s, the disillusioned began to search again for meaning and existential depth. Lewis bounced back, securing a growing and appreciative readership which kept growing in the final decade of the twentieth century. The reasons for this reversal in Lewis's fortunes are not totally understood. However, there are a number of straws in the wind which help us understand this remarkable resurgence of someone who had been written off by many as a relic of the past. Let me note three.
In the first place, the cultural upheavals of the 1960s gradually gave way to a fresh engagement with some of the deeper questions that Lewis had championed, and to which he provided engaging and winsome answers. His relentless championing of the ongoing relevance and validity of the cultural heritage of the past offered stability in the midst of what many regarded as cultural chaos and anarchy. Lewis's rejection of what he termed "chronological snobbery" opened the way to a revalidation and reappropriation of the religious and cultural legacy of the past.
Williams also made an appearance in an article in The Guardian about Lewis, which also mentions Pullman, who loathes Lewis. [I certainly don't expect Pullman's legacy to count for much in 50 year's time though. Is that too bitchy? :) ]
The Guardian article does make the point that the Shadowlands movie with Anthony Hopkins was about as far from fact in characterisation as a movie based on a real person could possibly be. The old (BBC?) telemovie version was infinitely better. I would hope someone might be replaying that somewhere this weekend.