Hi,
I would also need some help.

rootfs
Size 227.9M
Used 127.9M
Available 95.8M
Use% 57%

/dev/mmcblk0p2
Size 2.0G
Used 1.9G
Available 0
Use% 100%

The Settings>Memory shows
26,32GB available on Nokia N900 and
93,7MB available for Memory for installable applications

My problem is most likely emails - I use 3 Gmail accounts (1 private and 2 work ones), on IMAP protokol, so I cannot just delete emails. I had 4 accounts before, but had to remove one because of memory issues. Now, after a while also with 3, I am stuck without being able to download emails.