Most of the maintenance concerning the Corolla will be related to fluid and filter changes, some hardware components as they wear out over time. From your description - you've hit all the major maintenance points. Only things I'd add to that list would be brake fluid flush, powersteering fluid flush, replace PCV valve, plug wires, serpentine belt, hoses (at this age and mileage, start checking for rotting cooling system hoses), assuming you already got the air filter and transaxle filter. Of course, the usual run of checking over nuts and bolts on the chassis, inspection of the suspension, exhaust system, check wheel bearings, CV joint, tie-rod ends, lower ball joint, upper strut mounts, swaybar endlinks, suspension bushings, engine and transaxle torque mounts, etc.
As for the steering rack - you do need to change the oil in the powersteering reservoir at regular intervals - my concern is what the dealership was trying sell you repair wise on the rack. If the steering rack dust boots were ripped or missing, leaking oil from the seals, etc. - then you do have problem that needs to be addressed soon than later. If it was a scare tactic to pry some money from you - that is another thing all together.
There is a Owner's section on the Toyota main website (on my browser, it is on the bottom of the page) - navigate from the Owner's section to Owner's Manuals and to Warranty and Maintenance Guides.
Try this link, if you cannot find it:
http://www.toyota.com/owners/apps/maintenance-guides.do
Input model year and model and it will pop a link to a downloadable PDF file with all the service requirements for that car. The guide runs up to 120K miles, but can be extended for as many miles are needed - Note that there are major services every 30K miles that are very similar.