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Crothian said:What other books have you seen that would fit along well with this?
Well, let's see...
Nyambe works very well as a sourcebook for other regions in the same setting, though it has no bearing on Hamunaptra itself. Ditto Ancient Kingdoms: Mesopetamia, and of course Al-Qadim, though it (obviously) requires conversion to 3E.
If you're interested in adding more features from historical Egypt, Testament (also from Green Ronin) has some useful material, though Egypt itself is the focus of only a small portion of the book. Any sourcebook with desert-based monsters can make for some interesting additions.
What else...
If Sandstorm is comperable to Frostburn in quality and general type of content, I'm willing to bet that it'll make a good companion book. But not having seen it myself, I can't say for sure.
And if you're willing to look at a non-RPG book, check out Ancient Egyptian Magic, by Bob Brier. It's an older book, so a few of the ideas on Arabic culture are a bit off, but the discussion of magic and religion in Ancient Egypt is both spot-on and absolutely fascinating. This book influenced a lot of what I did with the magic sections I wrote, but there's so much more in there than I could ever have included. If you can find it, it's worth reading just to read, let alone as a sourcebook.