I've been reading Victoria Victorious, so look for a review soon. It's fairly interesting, so far. Though I've read a lot of Victorian novels, I don't know that much about Victoria herself, other than the very basics. It was interesting to see her portrayed, in the early part of her reign at least, as a bit of a brat, and Albert as a prig.
While I solider on with Victoria (long reign, long novel), here's a couple of Plaidy links for your perusal. Gata has a nice appreciation of Plaidy here. And here's a review by Kirsten of In the Shadow of the Crown.