My system is kinda wierd ^^;; Here's how I do 
it...first off, the order in which a series is 
placed is determined by number of cels per 
series. Like, in my Miscellaneous celbook, the 
first series you see is Nazca (6), followed by 
Mahou Tsukai Tai(technically 3, but since one of 
them is a -huge- genga set, it overshadows the 
number of cels from the next closest series), 
followed by Sailor Moon (5), and so on and so 
forth...

Secondly, I display them all with their 
respective sketches. If I display a cel with a 
sketch, it must be on the same "page"...i.e., 
they are opposing eachother. I don't like having 
to flip to another page to see my sketches, and I 
just don't like the way it looks.

Now, Tennimon is the series I collect the most 
from. A while ago, I thinned out my collection, 
which made a lot of room in my celbooks...this 
allowed me to have the luxury to split this 
collection between two celbooks. One contains 
the "regular" characters, and one contains Mikael 
and Raphael cels. Then,it gets split up even more 
than that...

Like, in my regular TnN celbook, I start off with 
my three opening cels...I like having a good cel 
to lead in, and the Noelle OP cel dancing in the 
flowers is perfect (she gets three sleeves (one 
for her, two for her sketches) since she looks 
better without the sketch behind her). After you 
see my three op cels, I then start by character. 
Noelle is the first cel you see...however, if a 
cel "matches" her well ( like, I got a Yuusuke 
that goes perfectly) I display it on thenext 
page, or even on the same page, and use the next 
page to display their respective sketches in the 
same manner (which of those I choose all depends 
on which looks better). I then display a cel of 
Noelle with Mama in the background, which allows 
me to move on to another character...Mama. If 
there isn't a cel of Mama with Papa, then I 
merely display Papa after her because he is 
married to her, and then look for a cel of Papa 
with Gabu,or with the group, to break into Gabu 
cels, etc. Sometimes group cels don't work out 
this way, so I move them to then end of a section.

In my Mikael and Raphael celbooks, I have Mikael 
cels first, chronologically how they're seen 
inthe series. I used winged Mikael to break into 
cels of Raphael, and from there go to celsof Mik 
and Raph. I end it with my two biggest spoiler 
cels (Fuyuki and Natsumi, ep 13).

Of course, I'm starting to run out of space 
again, so after TnN, my biggest passion in 
collecting (while I don't have very many cels), 
Toward the Terra, is stored in my Mik and Raph 
cel book, with about a page of space in between 
the two sections

....wow, this got really drawn out and 
complicated...I never realized how wierd my 
organization system was...eep...

-Misha