Same problem here with a Intel X-25M G2 160 GB SSD.
Fresh install of Kubuntu 10.04

r...@pc2010:/# cat /sys/block/sda/alignment_offset
0
r...@pc2010:/# cat /sys/block/sda/queue/minimum_io_size
512
r...@pc2010:/# cat /sys/block/sda/queue/optimal_io_size
0
r...@pc2010:/# cat /sys/block/sda/queue/physical_block_size
512
r...@pc2010:/# parted -m -s /dev/sda print
BYT;
/dev/sda:160GB:scsi:512:512:msdos:ATA INTEL SSDSA2M160;
1:1049kB:15,7GB:15,7GB:ext4::boot;
2:15,7GB:156GB:140GB:ext4::;
3:156GB:160GB:4299MB:linux-swap(v1)::;
r...@pc2010:/# fdisk -clu /dev/sda

Platte /dev/sda: 160.0 GByte, 160041885696 Byte
255 Köpfe, 63 Sektoren/Spur, 19457 Zylinder, zusammen 312581808 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c8d8d

   Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/sda1   *        2048    30664703    15331328   83  Linux
/dev/sda2        30664704   304183295   136759296   83  Linux
/dev/sda3       304183296   312580095     4198400   82  Linux Swap / Solaris

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parted fails to report partition alignment
https://bugs.launchpad.net/bugs/548792
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