Interesting collection.
Some notes:

• There are two nyaa proxies pages listed. nyaa.si is the actual “official” one. There has been malware in the past on nyaa proxies.
• sunxdcc is being fazed out. The same developer made a new search engine skullxdcc.com
• btdig.com is another highly capable dht crawler that could be added to the “Torrent Site” section.
• Kickass torrents is long, long dead the remaining sites are sketchy copy cats.
• kinozal requires sign-up; would probably good to note in the right hand column.
• irc.undernet.org/bookz and irc.irchighway.net/ebooks are XDCC servers for ebooks
• I don’t know if this would fit the DDL sites category, but some phenomenal ebook sites are: annas-archive.org, libgen.is, libgen.li and z-library.sk

It’s also an odd choice to put the predbs at the top, since that’s probably the category that people are least interested in, in my estimation.