Not very useful information for you, but: I participate in three Swedish forums, two general gardening forums but with rose sections, and the Swedish Rose Society Forum. Sweden is a small country so I've met many participants in these forums in real life. I used to frequent the Peter Beales forum but not so much now. I check a German forum quite often, forumplanten.de although my German is not so good as it was. I feel at home there because the roses discussed are very often varieties I grow myself, especially the old roses and species roses.

I still miss the old Usenet forum, rec.gardens.roses, the first forum I discovered in 1995 when the web was fairly new. I keep in touch regularly with one former member in Stockholm and we've met IRL about twice a year for the last 18 years. He's a very good source of unusual plants! I try to reciprocate but I don't have too many rarities.

There are two absolutely essential sites for Swedish gardeners, Virtuella floran, with all native plants, their habit, spread, etc, and their names in English, German and all Scandinavian languages, very useful for me. The other is SKUD a plant database of every garden plant sold in Sweden, now or formerly. They update all taxonomic information regularly. A godsend when taxonomists are working so hard to change plant names.

I also use some specialist databases, Hirsutum for rhododendrons and Clematis on the Web at the U of Hull, and HMF, of course.

I used to be on the RC (that place that this place won't let me mention it seems) a lot but it dwindled and seems to have disappeared now. I spend a lot of time on Garden Buddies but that's mostly for other things than roses because the rose forum there isn't very active and they're not die hard addicts like this place is, lol. I'm on the Rose Hybredizers forum but not particularly active because I'm such an amatuer and a lot of them are professionals so I don't have much to add to the discussion.

I spend most of my time here but the funny thing is I've never checked out anything other than the rose forums. I should go look around once in a while and see what else is here.