8.http://tinypic.com/view.php?pic=ieqs5v&s=8#.VGMU0b4qhSU

20.http://tinypic.com/view.php?pic=eba2vn&s=8#.VGMbvb4qhSU

31.http://tinypic.com/view.php?pic=xdcwlf&s=8#.VGMdkL4qhSU

38.http://tinypic.com/view.php?pic=1zednpf&s=8#.VGMfEr4qhSU

41.http://tinypic.com/view.php?pic=16m870k&s=8#.VGMfB74qhSU

4.Kouun no Rihatsushi ch.6
6.Amaiyo Maiyo ch.3
9.Omae de Nakya Dame Mitai ch.1
11.Omae de Nakya Dame Mitai ch.5
12.Suzumiya Haruhi no Yuuutsu dj - Boy Meets Boy
13.Amaiyo Maiyo ch.4
14.Yakudate! Seishun. ch.5
15.Maou no Keifu
17.Yongou x Keibi ch.1
19.Hounetsu Jive ch.7
22.Toshishita no Ryuugi
23.Mitsuyaku
24.kohitsuji to ookami ch.1
25.kohitsuji to ookami ch.3
27.Love Knot ch.7
28.Yoiko no Sumu Machi ch.6
29.kohitsuji to ookami ch.1
30.Yuushitessen no Koi ch.2
32.Yuushitessen no Koi ch.4
33.Junjou Ookami-san to Kohitsuji-kun
34.Koukyuu no Arika
35.Yakusoku no Yokan
39.Nekoka Kareshi no Ayashikata
40.Koushi Kakka no Himitsu Gaikou
42.Unknown Letters
43.Pink no Omocha
44.Hide and Seek ch.6
A few more look really familiar. If I remember i'll add
Also,you can try using google image search, sometimes it finds the source of the images.

2-3. Kachou Fuugetsu
5. Hanayome wa Oku san
10. Eroman - Kami to Pen to Sex to!!
16. Wanko to Nyanko
18. Love Knot
21. Kohitsuji to Ookami

I also agree Karona. For most of these, it's pretty easy to find using Google Image Search unless they're edited significantly.

1. Google told me it's Yakudate! Seishun. ch 4
2. Tengoku e Ikebaii
3. Kohitsuji to Ookami ch. 5
4. Yuigonjou Yori Ai wo Komete
5. Google told me it's Durarara!! dj - Yurippuru
6. Yuushitessen no Koi ch. 3 (I think this is 31 too but I'm unsure, this is a manga I dropped ...)

That most of the ones the other two posts above didn't get.

Yes yes, I know I make longwinded comments, but that's just me >.<
I should proof read my comments more, but I won't...
So keep in mind I'm filled with typos

Check out FAQ and Forum Rules if you haven't yet.
For errors linking in threads

THANKYOU SO MUCH Marona, lucky-chan and Kitty1826x!
And also how to you try to search the pictures on google? I'm not good with computers so I'm not that sure

Go to google > images > press the camera icon that says "search by image" and you have 2 options, upload it from your pc or post the link to the image.
Also:
38.Oishii Otoko (I think,didn't read the manga but the art style is the same)
41. A oneshot called "Otoko Benten Enbun Roku" by NITTA Youka

#8 is from Mask by Minami Megumu

There was also a not-yet-identified image (#45, perhaps?) from a manga by Oumi Shinano somewhere in the original post, I think...

20 Shihaisuru Yubisaki
31 Yuushitessen no Koi chapter 3

THANKS SO MUCH! And now I know how to search on images! Thanks Karona