As many people already know, the Rain of Fear client was recently added to Steam as well as a Free to Play (F2P) client download. The EQEmu Devs have been working on making this new client compatible with EQEmu and the majority of the work is already done. It shouldn't be much longer before the client is fully compatible (at least as much as Underfoot is anyway).
Both downloads are for the same client, so you can get RoF for free here:
Steam F2P Download Page
If you have Steam, you will be given the option to open it up in Steam and you can download it from there. If you do not have Steam installed, you will have the option to install it. Install it and then get the client from within Steam.
Once the client is downloaded, move the Everquest F2P folder to another location so it doesn't get patched by Steam at any point. Make sure not to start the client using the installed desktop icons. You do NOT want to patch the client to Live!
Then just follow the normal EQEmu client setup instructions here:
Getting Started Guide
It is recommended that everyone download this client now while it is available just in case something changes and it is no longer available or in case it gets patched on Steam, which would affect its compatibility with EQEmu.
As mentioned, there are still a few issues remaining to be worked out. You can follow the development of the new client here:
Steam RoF Development Tracking
Until the client is completed, there won't be many servers that you will be able to use it on. Once completed, you should be able to access servers with the RoF client once they have updated their source code to use the new client. Until then, there are a few servers out there that already have the client enabled for testing purposes, so you can try those out to check out the new client.
I added a brief list of new RoF features to the wiki at the bottom here:
RoF Client Features