I love, love, LOVE the furminator... Nala's ok with it/Gazzles doesn't really like it, but craisin bribes help a lot.
Thumperina, I think some rabbits just shed more in between molts than others - I feel like Gaz has been molting for the last four months, ever since she blew her juvenile coat. my entire life is coated in white fur. no matter how much I dust the bunny room, everything seems to have a thin but very visible coat of Gazzle's fur ><
if you don't brush as much as you should, that means they ingest more hair during routine grooming (both the shedding rabbit and their bonded partner if they have one). like cats, they can get hairballs from ingesting fur while grooming... but unlike cats, they lack the ability to vomit. as a result, a hairball can be dangerous or even life-threatening, as the blockage can lead to GI stasis.
a good warning sign that you're not grooming enough (which, unless there are other symptoms, doesn't - on it's own - indicate an actual hairball) is finding strings of poops strung together with hair. seeing two poops strung together every once in a while is no biggie, but if it happens more frequently, in a large quantity and/or it's many poops in a string then you're definitely not brushing enough and your bunny is at risk of a hairball.
papaya tablets (oxbow supplement) are stuffed full of extra papaya and pineapple enzymes, which supposedly help to break hair down - many people find it helpful to give them regularly, especially during a molt (keep in mind, they DO contain sugar - one a day at the most is plenty and don't give them a full serving of fruits or carrots on any day where you give a papaya tablet).
the best thing you can give a bunny to help prevent hairballs and help hair that gets ingested pass through the digestive system, though, is plain 'ol hay. encouraging them to eat lots of hay and drink lots of water is very important.
oh, and cat hairball remedies/treatments shouldn't be given - all they do is coat the hairball, which might help for cats when you want them to barf it up before it causes a blockage... but for bunnies, their only option for getting rid of a hairball is for it to get broken up - cat stuff actually makes that HARDER for their digestive system to accomplish.