作者じゃないけどマイリス2列化。
2列化のやりかた再現できなくて変えちゃったから、表示崩れてるかも。
[Patterns]
Name = "Nico: Mylist 1line => 2line (091210)"
Active = TRUE
Multi = TRUE
URL = "$TYPE(htm)www.nicovideo.jp/mylist/"
Limit = 256
Match = "(<div class=$AV(SYS_box_item))\#$SET(#="
"{math assign="line" equation="document.getElementById('SYS_page_items').childNodes.length%2"}"
" style="{if \$line==0}clear:left;float:left;{else}margin-left:492px;{/if}width:492px;")"
"([^<]++<table width=)\#$AV(672)$SET(#="492")"
"|($NEST(<div, style="padding:4px;*<p class=$AV(dot_2)*,</div>))\#$SET(#={if \$line>0}\n<div style="clear:left;"></div>{/if})"
"|(<body[^>]+>)\#$SET(#=\n<style type="text/css"><!-- .content_672 {overflow:visible;width:100%;} .content_312 {display:none;} --></style>)"
Replace = "\@"