The 802EW's routing feature set is pretty much the same as the RF500's, including the ability to use the serial port as either a WAN connection or for dial-in RAS access (you supply the modem). This makes the 802EW the only wireless router that I know of with a built-in RAS!
Note that the 802EW's firmware incorporates improvements made to the RF500 in its 4.48 firmware update. This means that support for IPsec and PPTP client passthru has been added, along with H.323/Netmeeting support. A 30 day trial for TZO's Dynamic DNS service is also bundled with the 802EW, which can be handy if you host any servers.
On the negative side, you're still limited to single port mapping, however, and the 32 port limit can get eaten up pretty quickly if you run gaming and other applications. You also can't temporarily disable any mappings, you have to delete them.