Here are episode summaries complete with screenshots! Because Mimitchi is lazy, the first 104 episodes are from Hamtaro.com. Any Japanese episodes, however, will be written by me or volunteers.
Read at your own risk, as this section is filled with unmarked spoilers.

Season 1
Episodes 001 - 052
Episodes 053 - 104

Season 2
Episodes 105 - 149
Episodes 150 - 193

Season 3: Hamu-Hamu Paradichu
Episodes 194 - 219
Episodes 220 - 244

Season 4: Dai Paradichu
Episodes 245 - 270
Episodes 271 - 296