Glenn's suggestion is the most economical if you can't have the devices on a network easily (or at all).
iPad with a video out adapter plus an iPod Touch running Keynote Remote. Turn off WiFi on both devices, turn on BlueTooth, open Keynote Remote on the iPod and Keynote on the iPad. Pairing is done from these apps, not the device's settings. Bluetooth should allow pairing the remote to Keynote after a few seconds. You'll need to type a confirmation code. Ignore any warning on the remote all about WiFi.
Is this an elegant solution? Somewhat, but it's not an elegant process. And it could be done a lot better, including with other possibilities already mentioned, BT remotes, better iOS to iOS connectivity, etc. No idea why Apple hasn't gone there yet.
Keynote Remote costs 99 cents and it does let you see the slides, including next slide and presentation notes. If you notice that some BT presentation remotes cost upwards of $100, I suppose it's not a terrible deal to pay $200 for an iPod touch and this app if it's something you'll use quite regularly.
The iPhone can now be used to control a Keynote presentation on an iPad (so you can walk around the stage and leave you iPad connected to the projector): Install Keynote on the iPad. Install Keynote Remote on the iPhone - The app works via WiFi (both the iPod and iPad need to be on the same network), or via Bluetooth (in which case both devices must have WiFi turned off and Bluetooth turned on in their settings - but do not pair your devices in General Settings). The Keynote Remote app needs to be paired directly with the iPad to work -- to do this launch the Keynote Remote app, select "Settings", then "New Keynote Link". You will see a four digit passcode. Launch Keynote on the iPad, go into its settings (the wrench icon at the top right of the screen), then in the Settings option, choose Remote. Turn the "Enable Remotes" option on. If your iPod remote is working, you should now see an option to "Link" to the remote -- press this button, then enter the four digit passcode you got from the Keynote Remote. The passcode will be verified, and then the remote should be linked to the iPad.
Of course if the network situation was possible, you wouldn't even need an iPad. Just an iPod Touch with Keynote and an AppleTV.
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