Benchmark time!
First up is my old boot drive. A Maxtor HD with 8mb cache with the disks spinning at 7200rpm.
Connected alone on the ATA100 connector.Xfer Size     Sequential Read   Sequential Write    Random Read      Random Write
1 KByte       924.044 KB/sec      3.981 MB/sec     56.354 KB/sec      3.472 MB/sec
2 KBytes        1.821 MB/sec      8.548 MB/sec      7.318 MB/sec      6.603 MB/sec
4 KBytes        5.901 MB/sec     16.095 MB/sec      2.124 MB/sec     12.828 MB/sec
8 KBytes       11.970 MB/sec     25.775 MB/sec     19.497 MB/sec     27.992 MB/sec
16 KBytes      22.312 MB/sec     46.936 MB/sec     11.066 MB/sec     39.931 MB/sec
32 KBytes      41.369 MB/sec     63.029 MB/sec      6.336 MB/sec     51.087 MB/sec
64 KBytes      31.752 MB/sec     75.075 MB/sec     31.729 MB/sec     63.762 MB/sec
128 KBytes     45.392 MB/sec     71.445 MB/sec     31.091 MB/sec     74.294 MB/sec
256 KBytes     49.185 MB/sec     82.091 MB/sec     33.819 MB/sec     78.429 MB/sec
512 KBytes     55.368 MB/sec     83.960 MB/sec     39.464 MB/sec     79.928 MB/sec
1 MByte        55.375 MB/sec     72.271 MB/sec     48.466 MB/sec     82.395 MB/sec
Next up is the current boot drive, a 16gb KingSpec Disk On Module (SSD). Connected alone on the ATA66 connector.Xfer Size     Sequential Read   Sequential Write    Random Read      Random Write
1 KByte         4.209 MB/sec      2.050 MB/sec      1.647 MB/sec    461.638 KB/sec
2 KBytes        8.507 MB/sec      4.778 MB/sec      6.489 MB/sec    884.603 KB/sec
4 KBytes       12.572 MB/sec      3.486 MB/sec     10.809 MB/sec      1.777 MB/sec
8 KBytes       21.351 MB/sec     14.735 MB/sec     18.614 MB/sec      3.143 MB/sec
16 KBytes      32.798 MB/sec     14.569 MB/sec     28.554 MB/sec      5.421 MB/sec
32 KBytes      42.985 MB/sec     16.507 MB/sec     39.274 MB/sec      7.666 MB/sec
64 KBytes      50.796 MB/sec     20.446 MB/sec     48.073 MB/sec      8.914 MB/sec
128 KBytes     52.409 MB/sec     22.214 MB/sec     51.373 MB/sec     15.947 MB/sec
256 KBytes     55.402 MB/sec     24.053 MB/sec     54.810 MB/sec     19.964 MB/sec
512 KBytes     56.388 MB/sec     23.999 MB/sec     55.947 MB/sec     21.453 MB/sec
1 MByte        57.575 MB/sec     24.458 MB/sec     57.249 MB/sec     19.771 MB/sec
As you can see the SSD is faster on reading, but slower on writing. Hence the speedup in boot time and overall responsivness of the system. Not increadable bemchmarks though.
Next up is connecting the SSD to the ATA100 connector 
