I don't see how those novels could have been an inspiration?
Yudkowsky describes Egan's work as an important influence in Creating Friendly AI, where he comments that a quote from Diaspora "affected my entire train of thought about the Singularity".
Though it's worth noting that this was a "That shouldn't happen" quote and not a "What a good idea" quote.
From a review of Greg Egan's new book, Zendegi:
(Original pointer via Kobayashi; Risto Saarelma found the review. I thought this was worthy of a separate thread.)