Portal shorts. Yes, it's another dumping ground for ideas that don't really go with anything else currently being worked on. So far also featuring: P-Body & ATLAS, and the Announcement Core.

Will the circle be unbroken, by and by? Multiple crossovers (seems only 2 per story here): Half Life, Singularity, Bioshock, System Shock 2, Portal. Other characters: Gordon Freeman, G-Man, Chell, Rosalind Lutece (how can there be Robert without Rosalind?), GLaDOS, Caroline, lots.