Instead of just hosting the RDoc at sequel.rubyforge.org, have an actual website, based on boof's design for www.ruby-sequel.org. However, drop the Rails project and instead create a plain html site generated with a simple script, a single template, and ERB. Also, add a fifth main feature to the README, showing off the improvements coming in 2.4.0.
For merging the READMEs, I put the model README at the bottom of the core README and used that. For merging the CHANGELOGs, I merged them manually back to 1.4.0, and copied the rest of the model CHANGELOG to the bottom of the file. Most of the Rakefile code was duplicative, but I think I got all tasks except spec_adapters. I figure few people have all 5 adapters necessary to run the adapter specs. I only have 3 of them, so I never used spec_adapters. The specs are still split up so they can be run independently. Additionally, the adapter specs are split off from the core specs, which helps if you want to put Sequel.connect lines in spec_config.rb. The only other spec changes were for path changes. There weren't conflicts merging anything else, IIRC. I hope there is no fallout from this. I haven't noticed any yet, running the specs and the test suites for all of my apps that use Sequel.
This should fix the problem of gems not having the correct RDoc options. The directory structure is changing so that RDoc is now stored in rdoc instead of doc/rdoc. This is because doc is now going to hold additional documentation files.