I love Dirk Maggs' H2G2 Tertiary, Quandary, and Quintessential phases adapatations of the third, fourth and fifth novels in the series. To the extent that I listened to them twice last week.
I love Douglas Adams' Dirk Gently books.
I love Dirk Maggs' radio adaptation of the first Dirk Gently book.
...for some reason, I just can't get into the radio adaptation of the second Dirk Gently book. I know not why, but I actually find it something of a chore. It could be that I'm doing something wrong.
I also recall that when I first read The Long Dark Tea-Time of the Soul, all the Norse mythology kind of reminded me of Tom Holt's Expecting Someone Taller, which I'd only read a year or two before. I'm not sure if they're that similar in plot, but. EST remains the only Tom Holt book I've actually read, despite quite liking it and vaguely meaning to check out some of his other works.