Re: The best of Other Pulp RPGs
Most of the pulp RPGs have something to offer, especially as you can find many of them going for a song on eBay. The best supported was certainly "Daredevils," and despite the slightly clunky rules the adventures at least are worth pinching.
TSR's "Agent 13 Sourcebook" has a specific background and is fairly brief in its coverage of the era, but there is enough non-system information there to mine for hints and adventure ideas. Likewise, the pulp setting for Rolemaster is detailed and chock full of events and timeline information tailored to pulp games, although it's a bit dry in comparison to "Cliffhangers" and other related and highly useful GURPS books ("Warehouse 23" alone should keep you in adventures for a year, and the harder to find "Places of Mystery" sparks so many ideas from every paragraph that it's worth a shelf of supplements from many publishers). I never had much time for White Wolf's offering, which puts a unique spin on the pulp era and manages to seem both padded and full of uninteresting information at the same time.
Much better is "Terra Incognita," which has a supporting website chock full of handy pulp links and is itself a delightful game presented with tongue in cheek and gadgets in every pocket. Since it's written for the descriptive Fudge system it also has the benefit of being easily adapted to other games. "Savage Worlds" is also easy to adapt, but the supplements are a bit pricey for the information they offer if you're not using that system (It's a very enjoyable game in its own right, however). This is often the case with D20 supplements too, which have a tendency to focus on new rules above all else.
Finally, FBI's "Mercenaries, Spies and Private Eyes" managed better than most to cover a wide range of pulp styles, be superbly playable, well written and brimming with wonderful advice for the GM. New Hero players might not be aware that several supplements for that game also sport Hero statistics (and it's written by "Justice, Inc" co-author Michael Stackpole.
Even the best game can benefit from the ideas found in other products, and although I shall be adding to "Justice, Inc" with the information from "Pulp Hero" when it comes out I fully expect to keep casting an eye over new pulp games as they come out: "Pulp Era" is next on my list. There is more than one reason to pick up another game, if you choose carefully.