I'm not sure about websites, but the Fodors and Lonely Planet guides are pretty much right on when it comes to advising women travellers on safety issues. As far as what I know from travelling as a solo woman myself, don't wander around Charlotte Amalie on St. Thomas at night - take a cab and stick together. You can easily wander into something or someplace you don't want to encounter. I'd recommend familiarizing yourself with a town map before venturing out.

Tortola is quite safe. Road Town is a town, so exercise the usual cautions, but the more lively beach bar areas, like Cane Garden Bay, are fine for going from beach bar to beach bar, restaurants, etc, day or night. I haven't spent much time in Road Town itself, except at a couple of spots near the local ferry dock and at Village Cay near the cruise ship dock, which has a pleasant and busy tavern/restaurant. Still felt safe walking there in the evening. During the day, no worries at all.

Seems I recall some websites devoted to women travellers, but they're not coming to mind. If I can find them, I'll repost.