There is one p2p program I know of and personally have used quite a bit, that has absolutely
*no* spyware/adware (I´ve checked--I know it for sure), and it´s not WinMX. It´s called Filetopia, found
here . It´s got a few similarities with IRC, being very channel based, more so than search oriented (i.e. your best bet is to be in a bunch of channels, search the channels for what you want, then grab the user´s list and get it from there). User lists range in quality and quantity, but many of the channel owners and operators (and some others) have lists in excess of 200 gig. (I heard that one user on FT had 1.2 terabytes in his list, but that may only be a rumor.) FT is characterized by a high quality in files, too, as you will almost *never* find viruses or spyware in anything you get.
Channels are formed by subject, by everything from soundtracks, e-books, folk music, TV episodes, and recent movie or game releases, for a few. Some are in other languages (mostly European ones). Public channels are generally friendly, and have several rules they must live by: they cannot kick you for having no list, though you may find users blocking you individually (the rule is share what you get), and they are required to keep the language clean and porn out. Non-public channels vary in rules such as who may enter and what you can be kicked/banned for. Channels marked A are adult and specifically allow porn, though kiddie porn earns a system-wide ban of that user´s nick as soon as it´s found, no matter what channel. Channels marked G are general, and keep vulgar language and porn out.
If you´re patient and willing to learn, FT has some of the best online communities, with the wonderful dimension of file-sharing, and there are many people who are ready to help you get set up. My personal favorites are #Folk Fans, #Folk Fans Too, #The Shepherds Bothy (not sure if I´ve got it exactly, but the channels are found via a channel list anyway), #MovieMusic, #TVseries, and #Gabriola Games. #FBO is one of the main movie ones, and the latter three are virtually the best of their type.
Hope you check out FT and enjoy it!