As others have said, 少年 and other youth-targeted manga tends to have full furigana. The trick is to realize that this category goes up higher than you'd think; Spriggan and Arms, for example, both qualify. Older-targeted manga has its furigana count drop precipitously, though it still varies (skimming through the copy of Young Jump I've got here shows that, say, 外天の夏 has a fair amount of the stuff, while ヘタコイ has almost none save names).
Just be careful, they'll still do things like obliterate furigana with emphasis markers and put alternative meanings (sometimes in kanji!) as furigana.
~J
Just be careful, they'll still do things like obliterate furigana with emphasis markers and put alternative meanings (sometimes in kanji!) as furigana.
~J