Kafkonia
First Post
I was thinking the other day that there are divine equivalents of the sorceror-style spontaneous casting (Favoured Soul) and wizard-style book-based casting (Archivist) but there's no arcane equivalent of the cleric's "pray for spells" variety. So I've put this together as kind of a thought experiment. My chief concern is that it may be overpowered by granting too much versatility to the arcane caster... I'm also not too fond of the name. 
Magic User
HD: d4
BAB: Poor
Saves: Will Good, Fort & Ref Poor
Skills: Concentration; Spellcraft; Knowledge (Arcana); Sense Motive; Craft; Profession.
Weapon and Armour Proficiency
The magic user is proficient with all simple weapons, but not with any type of armour or shield. Armour of any type interferes with a Magic User's movments, which can cause her spells with somatic components to fail.
Spells
A magic user casts arcane spells which are drawn from the wizard/sorceror spell list.
To prepare or cast a spell, a magic user must have a Intelligence score equal to at least 10 + the spell level (Int 10 for 0-level spells, 11 for 1st-level spells, and so forth.) The Difficulty Class for a savings throw against a magic user's spell is 10 + the spell level + the magic user's Charisma modifier.
Like other spellcasters, a magic user can only cast a certain number of spells per day. Her base daily allotment is given above. In addition, she receives bonus spells per day if she has a high Intelligence.
Once per day, the magic user must spend one hour to attune herself to the flow of magic across the plane on which she finds herself. At this time she draws upon the ambient magical energy to prepare her spells. A magic user may prepare and cast any spell on the wizard/sorceror spell list, provided that she can cast spells of that level, but she must choose which spells to prepare during her daily attunement.
Familiar
A magic user can obtain a familiar in exactly the same manner as a sorceror can.
Mastery of Magic
At 4th, 8th, 12th, and 16th level, the magic user's ability to attune herself to magic energy improves. She may select any spell not on the sorceror/wizard spell list, so long as it is no higher than one level below the highest level of spell that she can cast as a magic user. This spell is now considered to be on her spells known list, and can be prepared in the same manner as any sorceror/wizard spell.
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I put Sense Motive on the skills list because it seemed to fit with the idea of the class having a connection to the energy connecting people and things.

Magic User
HD: d4
BAB: Poor
Saves: Will Good, Fort & Ref Poor
Skills: Concentration; Spellcraft; Knowledge (Arcana); Sense Motive; Craft; Profession.
Code:
[B]Spellcasting Progression[/B]
[U]Level 0 1 2 3 4 5 6 7 8 9[/U]
1 3 1
2 4 2
3 4 3
4 4 3 1
5 4 3 2
6 5 3 3 1
7 5 4 3 2
8 5 4 3 3 1
9 5 4 4 3 2
10 5 4 4 3 3 1
11 5 4 4 3 3 2
12 5 5 4 4 3 3 1
13 6 5 4 4 3 3 2
14 6 5 4 4 4 3 3 1
15 6 5 5 4 4 3 3 2
16 6 5 5 4 4 4 3 3 1
17 6 6 5 5 4 4 3 3 2
18 6 6 5 5 4 4 4 3 3 1
19 6 6 5 5 5 4 4 3 3 2
20 6 6 6 5 5 4 4 4 3 3
Weapon and Armour Proficiency
The magic user is proficient with all simple weapons, but not with any type of armour or shield. Armour of any type interferes with a Magic User's movments, which can cause her spells with somatic components to fail.
Spells
A magic user casts arcane spells which are drawn from the wizard/sorceror spell list.
To prepare or cast a spell, a magic user must have a Intelligence score equal to at least 10 + the spell level (Int 10 for 0-level spells, 11 for 1st-level spells, and so forth.) The Difficulty Class for a savings throw against a magic user's spell is 10 + the spell level + the magic user's Charisma modifier.
Like other spellcasters, a magic user can only cast a certain number of spells per day. Her base daily allotment is given above. In addition, she receives bonus spells per day if she has a high Intelligence.
Once per day, the magic user must spend one hour to attune herself to the flow of magic across the plane on which she finds herself. At this time she draws upon the ambient magical energy to prepare her spells. A magic user may prepare and cast any spell on the wizard/sorceror spell list, provided that she can cast spells of that level, but she must choose which spells to prepare during her daily attunement.
Familiar
A magic user can obtain a familiar in exactly the same manner as a sorceror can.
Mastery of Magic
At 4th, 8th, 12th, and 16th level, the magic user's ability to attune herself to magic energy improves. She may select any spell not on the sorceror/wizard spell list, so long as it is no higher than one level below the highest level of spell that she can cast as a magic user. This spell is now considered to be on her spells known list, and can be prepared in the same manner as any sorceror/wizard spell.
----
I put Sense Motive on the skills list because it seemed to fit with the idea of the class having a connection to the energy connecting people and things.