apps2sd working, but /data size increasing?

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In short: When I install a new app, the app gets installed in /system/sd just fine (/data/app and /data/app-private symlinks work just fine) , but /data increases a little too.

before installing seesmic and pandora df shows:

Filesystem           1K-blocks      Used Available Use% Mounted on
tmpfs                   197584         0    197584   0% /dev
tmpfs                     4096         0      4096   0% /sqlite_stmt_journals
/dev/block/mtdblock3    148480    110484     37996  74% /system
/dev/block/mtdblock5    200960     62260    138700  31% /data
/dev/block/mtdblock4     97280     39952     57328  41% /cache
/dev/block/mmcblk0p2    702873     97721    567652  15% /system/sd
/dev/block/mmcblk0p2    702873     97721    567652  15% /data/dalvik-cache
/dev/block//vold/179:1
                      14898512    827680  14070832   6% /sdcard

After installing seesmic and pandora df shows:

Filesystem           1K-blocks      Used Available Use% Mounted on
tmpfs                   197584         0    197584   0% /dev
tmpfs                     4096         0      4096   0% /sqlite_stmt_journals
/dev/block/mtdblock3    148480    110484     37996  74% /system
/dev/block/mtdblock5    200960     62544    138416  31% /data
/dev/block/mtdblock4     97280     41280     56000  42% /cache
/dev/block/mmcblk0p2    702873    100347    565026  15% /system/sd
/dev/block/mmcblk0p2    702873    100347    565026  15% /data/dalvik-cache
/dev/block//vold/179:1
                      14898512    827680  14070832   6% /sdcard

1. Notice that /data increased by 300KB. Anyone know why?
2. why is my /data partition 31% used?

Yes, the size of the /data partition does increase even with apps2sd enabled... and from a quick analysis of the /data partition (with apps2sd enabled), I noticed this...
1. the applications are installed on the sd card and the /app & /app-private are symlinked
2. the application information is stored in /data/system/packages.xml (kinda like the windows registry)
3. some application data like shared prefs, extra libs (if any) are stored in /data/data

i guess this accounts for the usage size increase!!!

It looks like the apps are getting is installed to the sd card fine, but the app data still gets stored in the internal ROM
/data/data has 157 folders and is 52MB
/system/sd/app-private has 0 files and is 1K

Therefore it looks like either the apps2sd implementation is incomplete, or didnt get installed correctly.

Anyone tried moving /data/data to /system/sd/app-data and creating a symlink for it? (trying this now...)

darn it. after a reboot the OS removed my symlink, created a new /data/data folder, and apps are still writing to this folder now. lucky i made a backup.
... maybe while booting it saw that the /system/sd/app-data link was invalid (not mounted yet), and hence re-created the folder.